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