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


* 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]