Reformed Church in America Counties [ Metro Areas | States ]
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The Reformed Church in America, the oldest continuously existing Protestant church in the United States, perpetuates the religious life of the Dutch Reformed settlement of New Amsterdam (New York) in the seventeenth century.

Using data from the 1980-2010 Religious Congregations and Membership Studies, this list ranks U.S. counties on the highest total number of adherents and the highest percent of the population in the Reformed Church in America. You can sort the list by clicking on the column headings.

Complete List

Rank
2010
Rank
2000
Rank
1990
Rank
1980
County   [Download CSV]
Percent
2010
Percent
2000
Percent
1990
Percent
1980
124 130 151 144 Ada County, Idaho
0.06
0.07
--
--
131 132 151 144 Adams County, Colorado
--
0.05
--
--
128 135 147 142 Alameda County, California
0.02
0.02
0.03
0.01
65 56 53 48 Albany County, New York
1.23
1.79
2.14
2.81
27 25 5 30 Allegan County, Michigan
4.01
4.2
16.79
4.68
124 130 151 144 Allen County, Indiana
0.06
0.07
--
--
73 73 64 71 Antrim County, Michigan
0.94
1.13
1.63
1.55
126 130 151 130 Arapahoe County, Colorado
0.04
0.07
--
0.13
11 13 16 11 Aurora County, South Dakota
9.15
7.68
7.62
8.85
103 107 113 106 Barnes County, North Dakota
0.33
0.36
0.45
0.48
69 63 49 64 Barry County, Michigan
1.02
1.5
2.34
1.72
78 76 69 57 Bergen County, New Jersey
0.77
1.03
1.53
2.04
127 128 133 126 Berrien County, Michigan
0.03
0.09
0.18
0.17
39 61 97 100 Black Hawk County, Iowa
2.49
1.63
0.7
0.59
15 14 14 15 Bon Homme County, South Dakota
5.11
6.16
8.1
7.57
127 132 142 143 Bronx County, New York
0.03
0.05
0.08
0
60 63 73 82 Brookings County, South Dakota
1.29
1.5
1.44
1.15
128 134 144 139 Broward County, Florida
0.02
0.03
0.06
0.04
108 101 102 94 Bucks County, Pennsylvania
0.25
0.42
0.61
0.78
78 80 85 99 Burleigh County, North Dakota
0.77
0.9
1.01
0.6
131 135 146 137 Burlington County, New Jersey
--
0.02
0.04
0.06
13 9 9 8 Butler County, Iowa
7.49
11.2
11.29
10.76
85 84 95 92 Caddo County, Oklahoma
0.61
0.77
0.72
0.8
123 127 136 129 Calhoun County, Michigan
0.07
0.1
0.14
0.14
109 106 104 98 Carroll County, Illinois
0.24
0.37
0.58
0.63
124 124 135 119 Cascade County, Montana
0.06
0.13
0.15
0.27
125 127 140 143 Cass County, North Dakota
0.05
0.1
0.1
0
112 110 120 114 Cayuga County, New York
0.19
0.31
0.36
0.32
88 89 93 86 Cerro Gordo County, Iowa
0.53
0.67
0.76
0.99
19 28 36 45 Charles Mix County, South Dakota
4.6
3.99
3.98
3.2
38 37 47 73 Charlevoix County, Michigan
2.52
3.28
2.64
1.42
98 101 114 107 Chautauqua County, New York
0.4
0.42
0.44
0.47
12 12 12 13 Chippewa County, Minnesota
7.79
8.06
8.92
8.16
131 50 30 47 Clark County, South Dakota
--
1.98
4.41
2.88
23 20 39 43 Clay County, Iowa
4.41
4.7
3.86
3.26
101 103 109 104 Clinton County, Iowa
0.36
0.4
0.49
0.5
131 138 114 143 Clinton County, Michigan
--
--
0.44
0
123 111 117 143 Collin County, Texas
0.07
0.3
0.41
0
44 26 21 14 Columbia County, New York
2.19
4.07
5.56
7.78
74 76 79 52 Columbia County, Wisconsin
0.89
1.03
1.25
2.22
131 138 90 143 Columbus County, North Carolina
--
--
0.85
0
119 125 139 128 Comanche County, Oklahoma
0.11
0.12
0.11
0.15
128 138 151 144 Contra Costa County, California
0.02
--
--
--
119 122 130 123 Cook County, Illinois
0.11
0.16
0.21
0.22
126 132 143 133 Cuyahoga County, Ohio
0.04
0.05
0.07
0.1
110 109 110 143 Dakota County, Minnesota
0.23
0.32
0.48
0
94 90 151 144 Dallas County, Iowa
0.44
0.64
--
--
131 137 147 143 Dallas County, Texas
--
0
0.03
0
131 138 151 138 Dane County, Wisconsin
--
--
--
0.05
43 44 48 65 Davison County, South Dakota
2.24
2.5
2.56
1.69
90 93 103 96 Delaware County, New York
0.49
0.54
0.6
0.7
80 97 151 144 Delaware County, Ohio
0.69
0.49
--
--
131 130 151 144 Denton County, Texas
--
0.07
--
--
122 119 117 109 Denver County, Colorado
0.08
0.19
0.41
0.44
131 138 151 77 Deuel County, South Dakota
--
--
--
1.27
18 30 151 144 Dickinson County, Iowa
4.63
3.76
--
--
34 33 112 39 Dodge County, Wisconsin
2.8
3.41
0.46
3.76
131 111 113 121 Douglas County, Minnesota
--
0.3
0.45
0.24
118 127 136 131 Douglas County, Nebraska
0.13
0.1
0.14
0.12
7 2 2 3 Douglas County, South Dakota
12.46
18.22
22.56
18.3
125 129 139 133 DuPage County, Illinois
0.05
0.08
0.11
0.1
66 54 57 53 Dutchess County, New York
1.21
1.82
2
2.18
116 121 137 143 El Paso County, Colorado
0.15
0.17
0.13
0
25 21 25 21 Emmons County, North Dakota
4.08
4.64
4.89
6.35
131 138 151 142 Erie County, New York
--
--
--
0.01
131 138 151 118 Escambia County, Alabama
--
--
--
0.28
123 122 128 115 Essex County, New Jersey
0.07
0.16
0.24
0.31
131 138 94 143 Essex County, New York
--
--
0.73
0
50 62 61 55 Fillmore County, Minnesota
1.91
1.57
1.8
2.06
59 68 32 81 Fond du Lac County, Wisconsin
1.31
1.34
4.23
1.17
16 19 19 33 Franklin County, Iowa
5.08
5.06
5.99
4.33
131 138 98 143 Franklin County, New York
--
--
0.68
0
129 134 142 138 Franklin County, Ohio
0.01
0.03
0.08
0.05
118 123 151 144 Frederick County, Maryland
0.13
0.15
--
--
83 84 86 79 Freeborn County, Minnesota
0.64
0.77
1
1.22
128 138 151 144 Fresno County, California
0.02
--
--
--
128 134 146 143 Fulton County, Georgia
0.02
0.03
0.04
0
91 92 100 99 Fulton County, Illinois
0.48
0.58
0.64
0.6
107 87 91 87 Fulton County, New York
0.27
0.72
0.81
0.98
77 78 84 85 Gage County, Nebraska
0.82
1
1.05
1.01
124 128 141 133 Genesee County, Michigan
0.06
0.09
0.09
0.1
57 45 78 143 Gooding County, Idaho
1.4
2.47
1.26
0
48 51 71 88 Grand Traverse County, Michigan
1.95
1.95
1.47
0.91
75 69 88 69 Grant County, Minnesota
0.88
1.29
0.91
1.63
105 138 151 144 Grant County, South Dakota
0.3
--
--
--
46 42 40 32 Greene County, New York
2.07
2.69
3.78
4.49
28 15 15 16 Grundy County, Iowa
3.8
5.89
8.01
7.17
129 138 151 144 Gwinnett County, Georgia
0.01
--
--
--
124 128 130 143 Hamilton County, Indiana
0.06
0.09
0.21
0
22 29 31 34 Hamlin County, South Dakota
4.46
3.79
4.32
4.05
72 70 65 62 Hardin County, Iowa
0.95
1.27
1.62
1.76
96 94 76 76 Henderson County, Illinois
0.42
0.52
1.31
1.34
127 134 146 139 Hennepin County, Minnesota
0.03
0.03
0.04
0.04
71 74 72 63 Herkimer County, New York
0.97
1.08
1.46
1.74
128 134 147 137 Hillsborough County, Florida
0.02
0.03
0.03
0.06
117 122 124 101 Hudson County, New Jersey
0.14
0.16
0.3
0.56
56 57 56 44 Hunterdon County, New Jersey
1.42
1.77
2.01
3.22
106 113 135 116 Ingham County, Michigan
0.28
0.27
0.15
0.3
93 101 105 94 Iroquois County, Illinois
0.45
0.42
0.55
0.78
85 85 80 70 Island County, Washington
0.61
0.76
1.24
1.59
52 47 44 42 Jackson County, Kentucky
1.59
2.2
3.07
3.63
131 138 148 143 Jackson County, Missouri
--
--
0.02
0
21 17 17 23 Jasper County, Indiana
4.49
5.24
6.33
5.94
40 32 37 35 Jasper County, Iowa
2.34
3.43
3.91
3.9
119 126 135 143 Jefferson County, Colorado
0.11
0.11
0.15
0
105 115 121 114 Jefferson County, New York
0.3
0.25
0.34
0.32
113 115 151 144 Johnson County, Iowa
0.18
0.25
--
--
127 132 139 143 Johnson County, Kansas
0.03
0.05
0.11
0
131 138 151 35 Jones County, South Dakota
--
--
--
3.9
30 27 35 38 Kalamazoo County, Michigan
3.36
4
4.02
3.79
61 67 59 60 Kandiyohi County, Minnesota
1.27
1.35
1.84
1.83
68 79 89 90 Kankakee County, Illinois
1.06
0.92
0.87
0.85
39 41 33 28 Kent County, Michigan
2.49
3.07
4.14
4.9
129 135 146 138 King County, Washington
0.01
0.02
0.04
0.05
125 130 143 143 Kings County, New York
0.05
0.07
0.07
0
64 66 63 56 Kossuth County, Iowa
1.24
1.42
1.72
2.05
131 98 105 143 Lac qui Parle County, Minnesota
--
0.46
0.55
0
131 138 147 143 Lake County, Illinois
--
--
0.03
0
56 123 131 124 Lake County, Indiana
1.42
0.15
0.2
0.21
131 138 68 143 Lake County, Minnesota
--
--
1.54
0
53 55 54 58 LaMoure County, North Dakota
1.57
1.81
2.1
1.85
100 101 114 105 Lancaster County, Nebraska
0.38
0.42
0.44
0.49
131 138 147 143 Lee County, Florida
--
--
0.03
0
70 55 55 61 Leelanau County, Michigan
1.01
1.81
2.02
1.81
102 114 125 120 Lewis County, New York
0.34
0.26
0.29
0.26
26 35 23 25 Lincoln County, South Dakota
4.06
3.31
5.18
5.56
99 115 132 126 Linn County, Iowa
0.39
0.25
0.19
0.17
104 77 151 144 Los Alamos County, New Mexico
0.31
1.02
--
--
124 130 141 133 Los Angeles County, California
0.06
0.07
0.09
0.1
3 3 3 4 Lyon County, Iowa
20.31
17.24
17.96
17.11
129 135 147 138 Macomb County, Michigan
0.01
0.02
0.03
0.05
102 117 151 144 Madera County, California
0.34
0.21
--
--
29 28 27 29 Mahaska County, Iowa
3.59
3.99
4.6
4.74
126 124 123 98 Manatee County, Florida
0.04
0.13
0.32
0.63
104 108 115 111 Marathon County, Wisconsin
0.31
0.34
0.43
0.37
127 131 140 129 Maricopa County, Arizona
0.03
0.06
0.1
0.14
129 135 147 139 Marion County, Indiana
0.01
0.02
0.03
0.04
2 6 7 6 Marion County, Iowa
20.36
13.39
13.6
14.78
55 60 77 50 Marshall County, South Dakota
1.44
1.64
1.3
2.57
42 65 82 91 Mason County, Michigan
2.26
1.45
1.12
0.81
92 95 123 124 Medina County, Ohio
0.46
0.51
0.32
0.21
125 132 142 143 Mercer County, New Jersey
0.05
0.05
0.08
0
129 136 149 144 Miami-Dade County, Florida
0.01
0.01
0.01
--
129 136 149 143 Middlesex County, Massachusetts
0.01
0.01
0.01
0
110 104 106 95 Middlesex County, New Jersey
0.23
0.39
0.53
0.76
96 102 113 99 Midland County, Michigan
0.42
0.41
0.45
0.6
124 130 140 135 Milwaukee County, Wisconsin
0.06
0.07
0.1
0.08
52 53 62 68 Minnehaha County, South Dakota
1.59
1.83
1.76
1.64
14 24 20 17 Missaukee County, Michigan
5.69
4.41
5.83
6.8
131 138 147 143 Mobile County, Alabama
--
--
0.03
0
103 99 99 89 Monmouth County, New Jersey
0.33
0.45
0.65
0.87
122 126 133 122 Monroe County, New York
0.08
0.11
0.18
0.23
118 138 151 117 Monroe County, Pennsylvania
0.13
--
--
0.29
33 18 28 20 Montgomery County, New York
2.83
5.1
4.56
6.45
127 132 142 134 Montgomery County, Pennsylvania
0.03
0.05
0.08
0.09
106 97 108 93 Morris County, New Jersey
0.28
0.49
0.5
0.79
131 138 150 143 Multnomah County, Oregon
--
--
0
0
24 23 24 22 Murray County, Minnesota
4.38
4.53
4.9
6.17
32 39 41 41 Muskegon County, Michigan
2.9
3.19
3.59
3.64
117 120 128 112 Nassau County, New York
0.14
0.18
0.24
0.35
82 82 92 78 New York County, New York
0.65
0.81
0.77
1.26
49 40 38 36 Newaygo County, Michigan
1.93
3.18
3.9
3.89
37 22 22 31 Nobles County, Minnesota
2.63
4.6
5.35
4.62
131 138 151 127 Northampton County, Pennsylvania
--
--
--
0.16
131 136 148 141 Oakland County, Michigan
--
0.01
0.02
0.02
4 5 4 5 O'Brien County, Iowa
16.47
15.02
17.02
15.57
115 114 118 127 Ocean County, New Jersey
0.16
0.26
0.39
0.16
47 71 70 54 Oceana County, Michigan
2.05
1.19
1.49
2.13
62 49 52 51 Ogle County, Illinois
1.26
2.01
2.17
2.26
123 125 132 131 Oklahoma County, Oklahoma
0.07
0.12
0.19
0.12
119 122 127 114 Olmsted County, Minnesota
0.11
0.16
0.25
0.32
131 130 139 129 Oneida County, New York
--
0.07
0.11
0.14
122 126 136 125 Onondaga County, New York
0.08
0.11
0.14
0.18
104 94 97 95 Orange County, California
0.31
0.52
0.7
0.76
128 133 140 130 Orange County, Florida
0.02
0.04
0.1
0.13
103 91 88 80 Orange County, New York
0.33
0.6
0.91
1.19
8 8 10 9 Osceola County, Iowa
11.47
11.71
10.66
10.21
99 107 106 102 Otero County, New Mexico
0.39
0.36
0.53
0.52
6 4 6 2 Ottawa County, Michigan
12.62
15.3
14.12
21.24
130 136 148 139 Palm Beach County, Florida
0
0.01
0.02
0.04
131 129 123 130 Pasco County, Florida
--
0.08
0.32
0.13
89 86 87 67 Passaic County, New Jersey
0.5
0.74
0.99
1.66
131 138 145 138 Peoria County, Illinois
--
--
0.05
0.05
131 138 151 142 Philadelphia County, Pennsylvania
--
--
--
0.01
49 43 42 40 Phillips County, Kansas
1.93
2.6
3.46
3.73
117 100 111 143 Pike County, Pennsylvania
0.14
0.44
0.47
0
127 134 144 135 Pima County, Arizona
0.03
0.03
0.06
0.08
131 135 145 134 Pinellas County, Florida
--
0.02
0.05
0.09
10 11 13 12 Pipestone County, Minnesota
9.34
8.22
8.3
8.42
131 138 144 143 Placer County, California
--
--
0.06
0
85 138 151 144 Plymouth County, Iowa
0.61
--
--
--
76 84 97 110 Polk County, Iowa
0.85
0.77
0.7
0.42
116 120 126 143 Queens County, New York
0.15
0.18
0.26
0
124 129 138 132 Racine County, Wisconsin
0.06
0.08
0.12
0.11
131 138 151 130 Ramsey County, Minnesota
--
--
--
0.13
73 64 60 59 Rensselaer County, New York
0.94
1.48
1.83
1.84
118 121 125 143 Richmond County, New York
0.13
0.17
0.29
0
101 103 89 89 Rio Arriba County, New Mexico
0.36
0.4
0.87
0.87
106 101 118 112 Riverside County, California
0.28
0.42
0.39
0.35
5 7 8 7 Rock County, Minnesota
13.72
12.42
11.89
11.09
120 124 130 123 Rock County, Wisconsin
0.1
0.13
0.21
0.22
110 112 106 97 Rockland County, New York
0.23
0.29
0.53
0.68
117 123 129 122 Sacramento County, California
0.14
0.15
0.22
0.23
125 130 140 126 San Bernardino County, California
0.05
0.07
0.1
0.17
129 135 148 140 San Diego County, California
0.01
0.02
0.02
0.03
109 136 147 141 San Francisco County, California
0.24
0.01
0.03
0.02
113 115 127 118 San Joaquin County, California
0.18
0.25
0.25
0.28
131 134 148 143 San Mateo County, California
--
0.03
0.02
0
131 138 146 143 Santa Barbara County, California
--
--
0.04
0
124 129 147 140 Santa Clara County, California
0.06
0.08
0.03
0.03
124 123 139 122 Sarasota County, Florida
0.06
0.15
0.11
0.23
95 96 101 97 Saratoga County, New York
0.43
0.5
0.62
0.68
41 36 34 26 Schenectady County, New York
2.32
3.3
4.06
5.44
51 46 45 37 Schoharie County, New York
1.63
2.24
2.9
3.81
101 109 132 135 Scott County, Iowa
0.36
0.32
0.19
0.08
131 118 107 143 Scott County, Minnesota
--
0.2
0.51
0
124 133 151 144 Sedgwick County, Kansas
0.06
0.04
--
--
86 72 66 66 Seneca County, New York
0.59
1.18
1.61
1.67
20 21 29 27 Sheboygan County, Wisconsin
4.57
4.64
4.51
4.91
1 1 1 1 Sioux County, Iowa
32.97
35.71
35.97
34.45
126 130 142 133 Snohomish County, Washington
0.04
0.07
0.08
0.1
54 52 46 40 Somerset County, New Jersey
1.5
1.84
2.74
3.73
128 135 148 139 Sonoma County, California
0.02
0.02
0.02
0.04
121 126 151 144 St. Charles County, Missouri
0.09
0.11
--
--
97 83 83 72 St. Croix County, Wisconsin
0.41
0.78
1.1
1.44
125 127 141 136 Stanislaus County, California
0.05
0.1
0.09
0.07
81 81 76 75 Stephenson County, Illinois
0.68
0.89
1.31
1.37
125 127 137 134 Suffolk County, New York
0.05
0.1
0.13
0.09
87 88 74 83 Sullivan County, New York
0.57
0.71
1.38
1.14
123 121 138 126 Sussex County, New Jersey
0.07
0.17
0.12
0.17
131 136 151 144 Tarrant County, Texas
--
0.01
--
--
111 108 114 107 Tazewell County, Illinois
0.21
0.34
0.44
0.47
35 38 26 19 Thurston County, Nebraska
2.78
3.21
4.83
6.58
108 106 122 108 Tippecanoe County, Indiana
0.25
0.37
0.33
0.45
107 116 138 132 Tulare County, California
0.27
0.22
0.12
0.11
9 10 11 10 Turner County, South Dakota
10.4
9.39
9.49
9.56
45 48 75 107 Twin Falls County, Idaho
2.11
2.07
1.36
0.47
36 31 28 24 Ulster County, New York
2.73
3.45
4.56
5.72
126 133 140 134 Union County, New Jersey
0.04
0.04
0.1
0.09
63 66 67 88 Van Buren County, Michigan
1.25
1.42
1.56
0.91
83 138 151 144 Van Wert County, Ohio
0.64
--
--
--
128 133 145 143 Wake County, North Carolina
0.02
0.04
0.05
0
121 120 123 123 Walworth County, Wisconsin
0.09
0.18
0.32
0.22
114 119 134 126 Wapello County, Iowa
0.17
0.19
0.17
0.17
84 138 151 144 Warren County, Iowa
0.62
--
--
--
108 114 119 114 Washington County, New York
0.25
0.26
0.38
0.32
124 129 142 143 Washington County, Wisconsin
0.06
0.08
0.08
0
123 133 146 128 Washtenaw County, Michigan
0.07
0.04
0.04
0.15
129 133 142 134 Waukesha County, Wisconsin
0.01
0.04
0.08
0.09
127 133 142 132 Wayne County, Michigan
0.03
0.04
0.08
0.11
69 59 50 49 Wayne County, New York
1.02
1.66
2.27
2.73
131 114 151 144 Wayne County, Pennsylvania
--
0.26
--
--
102 105 116 96 Westchester County, New York
0.34
0.38
0.42
0.7
79 72 81 74 Whatcom County, Washington
0.73
1.18
1.21
1.4
17 16 18 18 Whiteside County, Illinois
4.97
5.62
6.16
6.66
117 110 129 132 Will County, Illinois
0.14
0.31
0.22
0.11
131 131 151 144 Williamson County, Tennessee
--
0.06
--
--
131 132 139 135 Winnebago County, Illinois
--
0.05
0.11
0.08
31 34 43 46 Winnebago County, Iowa
3.1
3.34
3.4
3.14
108 111 107 113 Wood County, Wisconsin
0.25
0.3
0.51
0.33
58 71 96 103 Woodbury County, Iowa
1.36
1.19
0.71
0.51
55 58 51 49 Wright County, Iowa
1.44
1.71
2.23
2.73
122 123 151 111 Wright County, Minnesota
0.08
0.15
--
0.37
120 125 134 132 Yakima County, Washington
0.1
0.12
0.17
0.11
67 75 58 84 Yankton County, South Dakota
1.13
1.06
1.96
1.08
120 123 131 143 Yavapai County, Arizona
0.1
0.15
0.2
0


* In an effort to better match the ASARB standards for adherents, a few religious bodies changed the way their adherents were reported in 2010, including Amish groups, Friends groups, Jewish groups, the Church of Jesus Christ of Latter-day Saints, Non-denominational Christian Churches, and the United Methodist Church. This change does not affect any of the data in the newly released 2010 U.S. Religion Census: Religious Congregations & Membership Study. In fact, the data for these groups are now more comparable to that of other bodies than it was in previous decadal reports.

However, the change in methodology can distort assessments on growth or decline between 2000 and 2010 for each of these groups. County-level 2000 data using the new methodology are not readily available. ASARB staff has adjusted some 2000 county-level adherent statistics to allow for a more accurate picture on growth or decline. The revised maps and charts are now available on-line at www.usreligioncensus.org for those who are interested in these trends.

Source

2010 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include statistics for 236 religious groups, providing information on the number of their congregations and adherents within each state and county in the United States. Clifford Grammich, Kirk Hadaway, Richard Houseal, Dale E. Jones, Alexei Krindatch, Richie Stanley and Richard H. Taylor supervised the collection. These data originally appeared in 2010 U.S. Religion Census: Religious Congregations & Membership Study, published by the Association of Statisticians of American Religious Bodies (ASARB). [More information on the data collection]