Reformed Church in America Counties (2010) [ 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.

Congregational "Adherents" include all full members, their children, and others who regularly attend services. "Percent" is the percentage of the total population that belongs to that denomination. Note: Adherents are sometimes residents of a county different than the location of their congregation.

[ More information on the data source ]

Complete List

Ranking County   [Download CSV]AdherentsPercent
6 Ottawa County, Michigan
33,297
12.62
39 Kent County, Michigan
14,993
2.49
1 Sioux County, Iowa
11,112
32.97
82 New York County, New York
10,268
0.65
104 Orange County, California
9,273
0.31
30 Kalamazoo County, Michigan
8,414
3.36
56 Lake County, Indiana
7,062
1.42
78 Bergen County, New Jersey
6,989
0.77
2 Marion County, Iowa
6,783
20.36
124 Los Angeles County, California
6,293
0.06
106 Riverside County, California
6,199
0.28
119 Cook County, Illinois
5,555
0.11
20 Sheboygan County, Wisconsin
5,276
4.57
32 Muskegon County, Michigan
4,997
2.9
36 Ulster County, New York
4,987
2.73
54 Somerset County, New Jersey
4,843
1.5
27 Allegan County, Michigan
4,465
4.01
65 Albany County, New York
3,729
1.23
76 Polk County, Iowa
3,651
0.85
41 Schenectady County, New York
3,597
2.32
66 Dutchess County, New York
3,588
1.21
116 Queens County, New York
3,445
0.15
39 Black Hawk County, Iowa
3,266
2.49
102 Westchester County, New York
3,244
0.34
17 Whiteside County, Illinois
2,907
4.97
52 Minnehaha County, South Dakota
2,693
1.59
89 Passaic County, New Jersey
2,531
0.5
34 Dodge County, Wisconsin
2,487
2.8
4 O'Brien County, Iowa
2,372
16.47
3 Lyon County, Iowa
2,352
20.31
103 Monmouth County, New Jersey
2,082
0.33
117 Sacramento County, California
2,057
0.14
109 San Francisco County, California
1,924
0.24
110 Middlesex County, New Jersey
1,874
0.23
117 Nassau County, New York
1,858
0.14
56 Hunterdon County, New Jersey
1,827
1.42
26 Lincoln County, South Dakota
1,818
4.06
48 Grand Traverse County, Michigan
1,700
1.95
45 Twin Falls County, Idaho
1,633
2.11
108 Bucks County, Pennsylvania
1,535
0.25
21 Jasper County, Indiana
1,502
4.49
73 Rensselaer County, New York
1,495
0.94
79 Whatcom County, Washington
1,467
0.73
33 Montgomery County, New York
1,420
2.83
58 Woodbury County, Iowa
1,388
1.36
106 Morris County, New Jersey
1,381
0.28
44 Columbia County, New York
1,379
2.19
59 Fond du Lac County, Wisconsin
1,335
1.31
5 Rock County, Minnesota
1,329
13.72
125 Kings County, New York
1,314
0.05
113 San Joaquin County, California
1,218
0.18
103 Orange County, New York
1,215
0.33
80 Delaware County, Ohio
1,210
0.69
68 Kankakee County, Illinois
1,204
1.06
107 Tulare County, California
1,183
0.27
13 Butler County, Iowa
1,113
7.49
127 Maricopa County, Arizona
1,101
0.03
100 Lancaster County, Nebraska
1,077
0.38
46 Greene County, New York
1,018
2.07
124 Santa Clara County, California
993
0.06
117 Will County, Illinois
970
0.14
12 Chippewa County, Minnesota
969
7.79
69 Wayne County, New York
955
1.02
63 Van Buren County, Michigan
954
1.25
116 El Paso County, Colorado
937
0.15
49 Newaygo County, Michigan
936
1.93
95 Saratoga County, New York
934
0.43
125 San Bernardino County, California
931
0.05
115 Ocean County, New Jersey
929
0.16
110 Dakota County, Minnesota
897
0.23
10 Pipestone County, Minnesota
896
9.34
117 Hudson County, New Jersey
878
0.14
9 Turner County, South Dakota
868
10.4
40 Jasper County, Iowa
863
2.34
14 Missaukee County, Michigan
845
5.69
99 Linn County, Iowa
820
0.39
29 Mahaska County, Iowa
804
3.59
92 Medina County, Ohio
797
0.46
106 Ingham County, Michigan
782
0.28
18 Dickinson County, Iowa
771
4.63
125 Suffolk County, New York
754
0.05
8 Osceola County, Iowa
741
11.47
23 Clay County, Iowa
735
4.41
110 Rockland County, New York
702
0.23
118 Douglas County, Nebraska
675
0.13
62 Ogle County, Illinois
672
1.26
38 Charlevoix County, Michigan
655
2.52
42 Mason County, Michigan
650
2.26
78 Burleigh County, North Dakota
628
0.77
71 Herkimer County, New York
626
0.97
118 Richmond County, New York
624
0.13
127 Wayne County, Michigan
604
0.03
69 Barry County, Michigan
601
1.02
101 Scott County, Iowa
598
0.36
122 Monroe County, New York
596
0.08
119 Jefferson County, Colorado
573
0.11
37 Nobles County, Minnesota
563
2.63
123 Essex County, New Jersey
559
0.07
47 Oceana County, Michigan
546
2.05
16 Franklin County, Iowa
543
5.08
61 Kandiyohi County, Minnesota
537
1.27
98 Chautauqua County, New York
534
0.4
51 Schoharie County, New York
534
1.63
124 Milwaukee County, Wisconsin
531
0.06
126 Cuyahoga County, Ohio
527
0.04
102 Madera County, California
517
0.34
123 Collin County, Texas
512
0.07
122 Denver County, Colorado
505
0.08
74 Columbia County, Wisconsin
503
0.89
123 Oklahoma County, Oklahoma
491
0.07
85 Island County, Washington
477
0.61
28 Grundy County, Iowa
473
3.8
125 DuPage County, Illinois
460
0.05
87 Sullivan County, New York
445
0.57
43 Davison County, South Dakota
436
2.24
108 Tippecanoe County, Indiana
426
0.25
104 Marathon County, Wisconsin
422
0.31
19 Charles Mix County, South Dakota
420
4.6
60 Brookings County, South Dakota
412
1.29
50 Fillmore County, Minnesota
398
1.91
127 Bronx County, New York
392
0.03
122 Onondaga County, New York
384
0.08
24 Murray County, Minnesota
382
4.38
7 Douglas County, South Dakota
374
12.46
15 Bon Homme County, South Dakota
361
5.11
129 San Diego County, California
360
0.01
128 Broward County, Florida
359
0.02
105 Jefferson County, New York
350
0.3
96 Midland County, Michigan
349
0.42
97 St. Croix County, Wisconsin
348
0.41
31 Winnebago County, Iowa
337
3.1
121 St. Charles County, Missouri
336
0.09
81 Stephenson County, Illinois
325
0.68
128 Alameda County, California
310
0.02
118 Frederick County, Maryland
299
0.13
127 Pima County, Arizona
299
0.03
127 Hennepin County, Minnesota
296
0.03
94 Dallas County, Iowa
291
0.44
126 Snohomish County, Washington
290
0.04
84 Warren County, Iowa
285
0.62
124 Sedgwick County, Kansas
283
0.06
111 Tazewell County, Illinois
280
0.21
129 King County, Washington
265
0.01
22 Hamlin County, South Dakota
263
4.46
128 Hillsborough County, Florida
262
0.02
124 Genesee County, Michigan
254
0.06
67 Yankton County, South Dakota
254
1.13
126 Arapahoe County, Colorado
252
0.04
11 Aurora County, South Dakota
248
9.15
99 Otero County, New Mexico
248
0.39
127 Montgomery County, Pennsylvania
243
0.03
128 Orange County, Florida
242
0.02
113 Johnson County, Iowa
241
0.18
123 Washtenaw County, Michigan
241
0.07
120 Yakima County, Washington
236
0.1
88 Cerro Gordo County, Iowa
234
0.53
124 Sarasota County, Florida
234
0.06
90 Delaware County, New York
233
0.49
125 Stanislaus County, California
232
0.05
73 Antrim County, Michigan
222
0.94
70 Leelanau County, Michigan
220
1.01
124 Ada County, Idaho
219
0.06
120 Yavapai County, Arizona
218
0.1
128 Fulton County, Georgia
217
0.02
57 Gooding County, Idaho
217
1.4
52 Jackson County, Kentucky
215
1.59
118 Monroe County, Pennsylvania
215
0.13
86 Seneca County, New York
207
0.59
124 Allen County, Indiana
202
0.06
83 Freeborn County, Minnesota
200
0.64
128 Wake County, North Carolina
197
0.02
35 Thurston County, Nebraska
193
2.78
64 Kossuth County, Iowa
192
1.24
126 Union County, New Jersey
192
0.04
55 Wright County, Iowa
191
1.44
83 Van Wert County, Ohio
185
0.64
108 Wood County, Wisconsin
185
0.25
85 Caddo County, Oklahoma
182
0.61
77 Gage County, Nebraska
182
0.82
125 Mercer County, New Jersey
181
0.05
128 Contra Costa County, California
178
0.02
91 Fulton County, Illinois
178
0.48
101 Clinton County, Iowa
177
0.36
127 Johnson County, Kansas
177
0.03
124 Hamilton County, Indiana
176
0.06
128 Fresno County, California
175
0.02
72 Hardin County, Iowa
166
0.95
120 Rock County, Wisconsin
163
0.1
119 Olmsted County, Minnesota
160
0.11
108 Washington County, New York
155
0.25
112 Cayuga County, New York
154
0.19
85 Plymouth County, Iowa
153
0.61
107 Fulton County, New York
152
0.27
129 Miami-Dade County, Florida
151
0.01
25 Emmons County, North Dakota
145
4.08
101 Rio Arriba County, New Mexico
145
0.36
119 Comanche County, Oklahoma
141
0.11
93 Iroquois County, Illinois
134
0.45
124 Racine County, Wisconsin
122
0.06
126 Manatee County, Florida
119
0.04
129 Marion County, Indiana
119
0.01
49 Phillips County, Kansas
109
1.93
129 Middlesex County, Massachusetts
106
0.01
123 Calhoun County, Michigan
102
0.07
123 Sussex County, New Jersey
100
0.07
129 Franklin County, Ohio
99
0.01
128 Sonoma County, California
97
0.02
122 Wright County, Minnesota
97
0.08
102 Lewis County, New York
91
0.34
121 Walworth County, Wisconsin
91
0.09
117 Pike County, Pennsylvania
83
0.14
124 Washington County, Wisconsin
81
0.06
125 Cass County, North Dakota
79
0.05
129 Macomb County, Michigan
75
0.01
55 Marshall County, South Dakota
67
1.44
129 Gwinnett County, Georgia
65
0.01
53 LaMoure County, North Dakota
65
1.57
130 Palm Beach County, Florida
63
0
114 Wapello County, Iowa
62
0.17
129 Waukesha County, Wisconsin
57
0.01
104 Los Alamos County, New Mexico
55
0.31
75 Grant County, Minnesota
53
0.88
124 Cascade County, Montana
52
0.06
127 Berrien County, Michigan
42
0.03
109 Carroll County, Illinois
37
0.24
103 Barnes County, North Dakota
36
0.33
96 Henderson County, Illinois
31
0.42
105 Grant County, South Dakota
22
0.3
131 Adams County, Colorado
--
--
131 Burlington County, New Jersey
--
--
131 Clark County, South Dakota
--
--
131 Clinton County, Michigan
--
--
131 Columbus County, North Carolina
--
--
131 Dallas County, Texas
--
--
131 Dane County, Wisconsin
--
--
131 Denton County, Texas
--
--
131 Deuel County, South Dakota
--
--
131 Douglas County, Minnesota
--
--
131 Erie County, New York
--
--
131 Escambia County, Alabama
--
--
131 Essex County, New York
--
--
131 Franklin County, New York
--
--
131 Jackson County, Missouri
--
--
131 Jones County, South Dakota
--
--
131 Lac qui Parle County, Minnesota
--
--
131 Lake County, Illinois
--
--
131 Lake County, Minnesota
--
--
131 Lee County, Florida
--
--
131 Mobile County, Alabama
--
--
131 Multnomah County, Oregon
--
--
131 Northampton County, Pennsylvania
--
--
131 Oakland County, Michigan
--
--
131 Oneida County, New York
--
--
131 Pasco County, Florida
--
--
131 Peoria County, Illinois
--
--
131 Philadelphia County, Pennsylvania
--
--
131 Pinellas County, Florida
--
--
131 Placer County, California
--
--
131 Ramsey County, Minnesota
--
--
131 San Mateo County, California
--
--
131 Santa Barbara County, California
--
--
131 Scott County, Minnesota
--
--
131 Tarrant County, Texas
--
--
131 Wayne County, Pennsylvania
--
--
131 Williamson County, Tennessee
--
--
131 Winnebago County, Illinois
--
--


* 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]