The most Mainline Protestant places in America

Counties and cities ranked by Mainline Protestant adherence (2020 U.S. Religion Census) — beside each place's 2024 vote and its shift since 2020. Of the top 100 counties by mainline protestant, 97 voted Republican and 3 Democratic in 2024 (median R+40.2); as a group they shifted −3.7 points toward Republicans from 2020 to 2024.

Top 100 counties

Counties ≥ 5,000 population, ranked by Mainline Protestant. “2024” is the two-party presidential margin; “Since ’20” is the 2020→2024 shift in points (positive = toward Democrats). Sources: U.S. Census ACS 2024 5-year · 2020 U.S. Religion Census (ASARB) · MIT Election Lab.
#	Place	Mainline Protestant	2024	Since ’20
1	Lac qui Parle County, MN	57.0%	R R+32.2	−5.4
2	Winnebago County, IA	56.5%	R R+30.6	−4.3
3	Kingsbury County, SD	55.9%	R R+43.9	−4.8
4	Norman County, MN	51.9%	R R+22.2	−6.2
5	Grant County, MN	51.2%	R R+30.5	−3.9
6	Chippewa County, MN	50.7%	R R+34.0	−3.4
7	Fillmore County, MN	44.1%	R R+25.4	−2.8
8	Winneshiek County, IA	43.8%	R R+9.2	−4.1
9	Dixon County, NE	43.8%	R R+58.5	−4.0
10	Worth County, IA	43.5%	R R+28.2	−2.3
11	Fillmore County, NE	42.8%	R R+54.7	−1.7
12	McHenry County, ND	42.7%	R R+63.4	−3.4
13	Pennington County, MN	41.1%	R R+31.4	−4.4
14	Rock County, MN	40.5%	R R+39.2	−0.5
15	Williamsburg city, VA	40.3%	D D+44.3	+3.2
16	Traill County, ND	40.0%	R R+31.4	−6.5
17	Renville County, MN	39.0%	R R+41.3	−4.8
18	Freeborn County, MN	38.4%	R R+21.3	−5.3
19	Barnes County, ND	38.4%	R R+35.0	−3.6
20	Emmet County, IA	38.0%	R R+43.9	−8.0
21	Faribault County, MN	37.9%	R R+37.3	−3.7
22	Yukon-Koyukuk Census Area, AK	37.4%	D D+5.2	−26.0
23	Schuyler County, NY	37.4%	R R+20.9	−3.2
24	Russell County, KS	37.2%	R R+61.3	+1.9
25	Marshall County, MN	37.2%	R R+51.6	−4.2
26	Yellow Medicine County, MN	37.0%	R R+40.5	−3.5
27	Ransom County, ND	36.9%	R R+28.0	−8.7
28	Pope County, MN	36.8%	R R+31.6	−3.9
29	Butler County, IA	36.4%	R R+45.2	−6.7
30	Lyon County, IA	36.1%	R R+69.6	−2.0
31	Pembina County, ND	36.1%	R R+52.9	−2.6
32	Lincoln County, MN	35.9%	R R+37.7	+0.4
33	Stevens County, MN	35.9%	R R+27.0	−4.9
34	Chickasaw County, IA	35.6%	R R+37.1	−5.8
35	Boone County, NE	35.5%	R R+65.9	+0.9
36	Grundy County, IA	35.2%	R R+41.7	−4.3
37	Sioux County, IA	35.1%	R R+70.7	−4.2
38	Goodhue County, MN	35.0%	R R+16.4	−1.6
39	Gage County, NE	35.0%	R R+39.0	−2.5
40	Swift County, MN	34.9%	R R+34.1	−4.6
41	Taylor County, IA	34.7%	R R+55.7	−2.8
42	Clayton County, IA	34.1%	R R+34.4	−5.6
43	Kandiyohi County, MN	34.1%	R R+30.9	−5.3
44	Bremer County, IA	34.0%	R R+22.1	−6.0
45	Ida County, IA	33.8%	R R+53.2	−2.2
46	Day County, SD	33.7%	R R+29.9	−2.3
47	Jackson County, MN	33.4%	R R+42.0	−4.1
48	Marion County, IA	33.0%	R R+37.6	−3.9
49	Franklin County, IA	32.9%	R R+41.6	−6.6
50	Wayne County, NE	32.9%	R R+48.8	−0.4
51	Montgomery County, IA	32.7%	R R+39.0	−0.0
52	Covington city, VA	32.4%	R R+33.2	−9.6
53	Turner County, SD	32.3%	R R+51.3	−4.0
54	Pendleton County, WV	32.0%	R R+58.6	−5.0
55	Watonwan County, MN	31.7%	R R+27.7	−6.2
56	Allamakee County, IA	31.5%	R R+34.3	−5.2
57	Lake County, SD	31.5%	R R+31.2	−3.7
58	Trempealeau County, WI	30.9%	R R+21.4	−4.8
59	Clay County, IA	30.6%	R R+43.1	−4.3
60	Dickinson County, IA	30.5%	R R+39.9	−6.3
61	Dodge County, MN	30.5%	R R+31.9	−1.5
62	Hamilton County, NE	30.4%	R R+60.1	−2.8
63	Mitchell County, IA	30.3%	R R+31.1	−3.2
64	Steele County, MN	30.3%	R R+24.4	−2.0
65	Cottonwood County, MN	30.2%	R R+41.0	−2.8
66	McLean County, ND	30.1%	R R+57.9	−4.3
67	Calhoun County, IA	30.0%	R R+46.7	−4.5
68	Bottineau County, ND	29.9%	R R+54.9	−4.4
69	Murray County, MN	29.8%	R R+42.3	−3.2
70	Scott County, KS	29.6%	R R+74.7	−1.9
71	Pipestone County, MN	29.6%	R R+48.0	−2.5
72	Otoe County, NE	29.6%	R R+38.8	−0.9
73	Roberts County, SD	29.5%	R R+23.0	−9.6
74	O'Brien County, IA	29.4%	R R+60.7	−3.9
75	Walsh County, ND	29.2%	R R+44.8	−3.1
76	Braxton County, WV	29.1%	R R+51.9	−4.9
77	Hancock County, IA	29.0%	R R+47.4	−3.5
78	Audubon County, IA	28.6%	R R+38.3	−2.5
79	Kearney County, NE	28.5%	R R+57.9	+0.8
80	Alfalfa County, OK	28.5%	R R+76.6	+0.6
81	Lake County, MN	28.4%	D D+3.9	+0.3
82	Linn County, MO	28.2%	R R+57.2	−3.3
83	Woods County, OK	28.2%	R R+64.3	+1.0
84	Redwood County, MN	28.1%	R R+43.2	−1.9
85	Cherokee County, IA	28.0%	R R+45.7	−6.4
86	Hardin County, IA	28.0%	R R+38.3	−6.3
87	McPherson County, KS	27.9%	R R+41.1	−0.7
88	Wilkin County, MN	27.9%	R R+38.9	−0.9
89	Knox County, NE	27.6%	R R+63.1	−3.3
90	Moody County, SD	27.6%	R R+31.9	−7.8
91	Spink County, SD	27.6%	R R+39.0	−4.0
92	Clay County, NE	27.4%	R R+63.3	−1.2
93	Big Stone County, MN	27.0%	R R+29.5	−2.2
94	Humboldt County, IA	26.7%	R R+49.9	−5.2
95	Rice County, KS	26.5%	R R+56.7	−3.5
96	Jefferson County, NE	26.5%	R R+45.2	−2.3
97	Sac County, IA	26.4%	R R+51.5	−3.2
98	Keokuk County, IA	26.3%	R R+51.5	−6.5
99	Wright County, IA	26.3%	R R+36.4	−2.2
100	York County, NE	26.3%	R R+51.1	+0.7

Top 50 cities

Incorporated places ≥ 5,000 population. City presidential results are precinct-derived for 2008–2024, so the “Since ’20” shift uses the same modern series.
#	Place	Mainline Protestant	2024	Since ’20
1	Montevideo, MN	50.7%	R R+21.3	−3.0
2	Decorah, IA	43.8%	D D+27.3	+7.0
3	Thief River Falls, MN	41.1%	R R+22.8	−3.2
4	Williamsburg, VA	40.3%	D D+44.0	+2.9
5	Albert Lea, MN	38.4%	R R+9.1	−4.2
6	Valley, ND	38.4%	R R+23.1	−2.1
7	Estherville, IA	38.0%	R R+33.7	−9.9
8	Morris, MN	35.9%	R R+1.0	−6.9
9	Orange, IA	35.1%	R R+61.7	−7.0
10	Sioux Center, IA	35.1%	R R+66.0	−1.4
11	Red Wing, MN	35.0%	D D+7.0	+0.6
12	Beatrice, NE	35.0%	R R+29.2	+0.4
13	Willmar, MN	34.1%	R R+14.1	−8.4
14	Waverly, IA	34.0%	R R+2.1	−3.8
15	Knoxville, IA	33.0%	R R+29.9	−12.9
16	Pella, IA	33.0%	R R+36.5	−0.3
17	Wayne, NE	32.9%	R R+27.3	−2.1
18	Red Oak, IA	32.7%	R R+32.1	−2.1
19	Covington, VA	32.4%	R R+33.3	−9.6
20	Madison, SD	31.5%	R R+17.0	−3.7
21	Spencer, IA	30.6%	R R+36.8	−5.5
22	Spirit Lake, IA	30.5%	R R+36.7	−7.4
23	Kasson, MN	30.5%	R R+23.7	−3.0
24	Owatonna, MN	30.3%	R R+16.2	−1.7
25	Sheldon, IA	29.6%	R R+61.8	−2.3
26	Nebraska, NE	29.6%	R R+35.9	+1.8
27	Redwood Falls, MN	28.1%	R R+25.6	−3.3
28	Cherokee, IA	28.0%	R R+53.5	−27.1
29	Iowa Falls, IA	28.0%	R R+25.0	−8.0
30	McPherson, KS	27.9%	R R+35.4	+0.3
31	York, NE	26.3%	R R+41.6	+1.0
32	West Point, MS	26.1%	D D+18.7	−5.2
33	Oelwein, IA	26.0%	R R+9.0	−12.4
34	Wahpeton, ND	25.9%	R R+35.3	−6.8
35	Strasburg, VA	25.8%	R R+30.6	+0.4
36	Woodstock, VA	25.8%	R R+27.3	−1.1
37	Port Clinton, OH	25.5%	R R+6.6	−2.6
38	Adel, IA	25.4%	R R+20.9	−5.1
39	Perry, IA	25.4%	D D+4.9	−7.0
40	Waukee, IA	25.4%	D D+1.5	−3.0
41	Webster, IA	25.4%	R R+21.1	−7.4
42	Austin, MN	25.0%	D D+5.3	−6.0
43	Fairmont, MN	25.0%	R R+28.4	−0.5
44	Anamosa, IA	24.7%	R R+17.9	−9.0
45	Atlantic, IA	24.7%	R R+31.1	+0.9
46	Jamestown, ND	24.6%	R R+37.0	−0.1
47	Watertown, SD	24.5%	R R+37.7	−1.6
48	Charles, IA	24.3%	R R+10.0	−5.8
49	Moorhead, MN	24.3%	D D+13.8	−2.3
50	Clear Lake, IA	24.2%	R R+22.6	−4.8

Rankings suppress places below 5,000 population, where small-sample ACS shares get noisy. Demographic shares are American Community Survey 5-year estimates (ancestry table B04006, language C16001) and the 2020 U.S. Religion Census; every figure traces to a named federal or academic source. The vote columns are presidential — a place can be demographically homogeneous and politically split, which is exactly what these tables are built to show.