Catholic Church States [ Counties | Metro Areas ]
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The Roman Catholic Church first colonized what was to become the United States in 1565. Through processes of immigration and evangelism it became the largest denomination in America in the late nineteenth century and remains so today.

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

Complete List

Rank
2010
Rank
2000
Rank
1990
Rank
1980
State   [Download CSV]
Percent
2010
Percent
2000
Percent
1990
Percent
1980
47 50 46 45 Alabama
4.2
3.39
3.41
2.73
41 40 39 37 Alaska
7.16
8.67
8.22
9.87
27 26 24 23 Arizona
14.55
19
17.89
17.84
46 46 48 48 Arkansas
4.21
4.34
3.1
2.39
9 12 16 19 California
27.47
29.76
24
20.11
25 29 30 31 Colorado
16.14
17.49
14.66
13.96
4 4 3 3 Connecticut
35.06
40.3
41.82
44.75
17 24 25 25 Delaware
20.33
19.36
17.46
17.34
32 13 33 29 District Of Columbia
12.62
27.98
12.78
15.01
30 32 35 26 Florida
13.37
16.24
12.35
16.67
42 44 47 46 Georgia
6.16
4.57
3.24
2.58
19 22 20 17 Hawaii
18.35
19.88
21
21.77
40 38 40 39 Idaho
7.87
10.11
7.34
7.47
6 9 8 9 Illinois
28.44
31.2
31.59
31.51
35 35 34 34 Indiana
11.53
13.75
12.61
13.19
24 25 23 21 Iowa
16.51
19.07
18.74
18.57
26 34 29 30 Kansas
14.95
15.1
14.9
14.26
39 39 37 36 Kentucky
8.29
10.05
9.91
9.98
10 11 6 10 Louisiana
26.49
30.94
32.44
31.01
29 18 17 14 Maine
14.31
22.2
21.54
24.53
28 28 26 24 Maryland
14.5
17.98
17.42
17.46
1 2 2 2 Massachusetts
44.9
48.7
49.22
53
21 21 15 16 Michigan
17.38
20.32
25.16
22.06
14 15 14 13 Minnesota
21.69
25.63
25.37
25.56
50 47 45 43 Mississippi
3.79
4.07
3.69
3.77
33 33 28 28 Missouri
12.09
15.32
15.67
16.28
31 27 27 22 Montana
12.9
18.76
15.74
17.85
16 19 18 18 Nebraska
20.41
21.78
21.25
21.2
23 30 32 32 Nevada
16.7
16.61
13.06
13.75
13 7 12 10 New Hampshire
23.63
34.9
26.78
31.01
3 3 4 4 New Jersey
36.8
40.44
41.26
40.17
7 6 10 6 New Mexico
28.41
36.86
30.85
33.41
5 5 5 5 New York
32.44
39.79
40.47
35.64
48 48 50 50 North Carolina
4.12
3.92
2.26
1.61
12 14 11 12 North Dakota
24.88
27.93
27.15
26.66
22 23 22 15 Ohio
17.27
19.66
19.75
22.54
45 43 43 44 Oklahoma
4.76
4.89
4.57
3.61
37 37 38 35 Oregon
10.41
10.18
9.84
12.18
8 10 9 8 Pennsylvania
27.58
30.96
30.93
32.72
2 1 1 1 Rhode Island
44.33
51.73
63.12
63.65
49 49 50 49 South Carolina
3.93
3.41
2.26
1.89
20 17 21 20 South Dakota
18.29
24.04
20.66
20.03
51 51 49 47 Tennessee
3.5
3.22
2.81
2.5
18 20 19 27 Texas
18.59
20.95
21.04
16.45
43 45 44 42 Utah
5.79
4.35
3.85
4.1
15 16 13 11 Vermont
20.5
24.3
25.58
30.62
38 41 41 41 Virginia
8.42
8.56
6.21
5.32
34 36 36 38 Washington
11.66
12.15
10.82
9.2
44 42 42 40 West Virginia
5.17
5.83
6.05
5.4
11 8 7 7 Wisconsin
25.07
31.61
31.77
32.83
36 31 31 33 Wyoming
10.86
16.29
13.13
13.27


* 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]