Prevention

Mammography Screening (Women 50-74) by County — US Rankings

CDC PLACES 2023 · Age-adjusted prevalence · All 3,144 US counties

Mammography uptake is reported among women aged 50-74 with a screening mammogram in the past two years, per the USPSTF guideline window that PLACES uses. The measure is highly sensitive to insurance status, primary-care engagement, and the local availability of screening facilities — particularly in rural counties where the nearest mammography center can be more than 30 miles away. National screening rates have plateaued for several years; the county-level variance is wide.

How this ranking is built

Source: CDC PLACES 2023 release. Methodology: BRFSS survey responses pooled across years, fitted with a small-area statistical model, age-adjusted to the 2000 US standard population. Confidence intervals (95%) are shown for each county — wider intervals indicate more uncertainty in the modeled estimate, typically driven by smaller populations.

Highest Mammography (women 50-74) Rates — Top 100 Counties

Counties with the highest reported mammography (women 50-74) rates — these counties lead the nation on this measure.

#	County	Rate	95% CI	State
1	Plymouth County	86.6%	82.3 – 90.1	Massachusetts
2	Norfolk County	86.4%	82.3 – 90.2	Massachusetts
3	Anne Arundel County	86.0%	82.1 – 89.2	Maryland
4	Suffolk County	85.0%	80.8 – 88.6	Massachusetts
5	Jefferson County	84.2%	79.6 – 88.1	Alabama
6	Worcester County	84.0%	79.4 – 87.8	Massachusetts
7	Kent County	83.9%	79.0 – 88.1	Rhode Island
8	Bristol County	83.8%	78.0 – 88.4	Rhode Island
9	Hampshire County	83.8%	78.3 – 88.4	Massachusetts
10	Waukesha County	83.6%	79.1 – 87.6	Wisconsin
11	Essex County	83.6%	78.7 – 87.6	Massachusetts
12	Ozaukee County	83.5%	77.6 – 88.6	Wisconsin
13	Delaware County	83.5%	78.7 – 87.5	Ohio
14	Scott County	83.3%	78.1 – 87.8	Iowa
15	Saratoga County	83.0%	77.6 – 87.6	New York
16	Washington County	83.0%	78.4 – 87.0	Minnesota
17	Howard County	82.9%	77.1 – 87.6	Maryland
18	Racine County	82.8%	77.7 – 87.2	Wisconsin
19	St. James Parish	82.8%	76.5 – 88.2	Louisiana
20	Waupaca County	82.7%	76.8 – 87.6	Wisconsin
21	Middlesex County	82.7%	79.7 – 86.8	Virginia
22	Milwaukee County	82.6%	78.6 – 86.3	Wisconsin
23	Forsyth County	82.6%	76.4 – 87.7	North Carolina
24	Newport County	82.4%	76.8 – 87.1	Rhode Island
25	Barnstable County	82.4%	76.8 – 87.1	Massachusetts
26	Norfolk city	82.3%	77.3 – 86.8	Virginia
27	Monongalia County	82.2%	76.3 – 87.2	West Virginia
28	Otsego County	82.2%	76.5 – 87.0	New York
29	Nantucket County	82.1%	75.4 – 87.6	Massachusetts
30	Calvert County	82.1%	77.0 – 86.7	Maryland
31	Providence County	82.0%	77.2 – 86.2	Rhode Island
32	Washington County	82.0%	76.8 – 86.5	Oregon
33	Onondaga County	82.0%	76.7 – 86.6	New York
34	Bristol County	82.0%	77.2 – 86.2	Massachusetts
35	Franklin County	82.0%	77.0 – 86.3	Maine
36	Grundy County	82.0%	75.3 – 87.4	Iowa
37	Benton County	82.0%	75.1 – 87.3	Iowa
38	Winnebago County	81.8%	76.3 – 86.3	Wisconsin
39	Brown County	81.8%	76.3 – 86.4	Wisconsin
40	Cass County	81.8%	76.4 – 86.3	North Dakota
41	Davie County	81.8%	75.1 – 87.3	North Carolina
42	Olmsted County	81.8%	75.8 – 87.0	Minnesota
43	Dukes County	81.8%	75.5 – 87.4	Massachusetts
44	East Baton Rouge Parish	81.8%	76.2 – 86.6	Louisiana
45	Madison County	81.8%	75.4 – 87.2	Iowa
46	Chesterfield County	81.7%	77.4 – 85.8	Virginia
47	Carver County	81.7%	76.1 – 86.6	Minnesota
48	West Baton Rouge Parish	81.7%	75.3 – 87.3	Louisiana
49	Falls Church city	81.6%	75.1 – 87.1	Virginia
50	Middlesex County	81.6%	77.0 – 85.3	Massachusetts
51	York County	81.6%	76.8 – 85.8	Maine
52	Lafayette Parish	81.6%	75.7 – 86.7	Louisiana
53	Johnson County	81.6%	75.9 – 86.4	Iowa
54	Alexandria city	81.5%	75.3 – 87.0	Virginia
55	Putnam County	81.5%	75.7 – 86.7	Ohio
56	Johnston County	81.5%	75.0 – 86.9	North Carolina
57	Queen Anne's County	81.5%	75.9 – 86.0	Maryland
58	Kent County	81.5%	75.4 – 86.6	Maryland
59	Fairfax County	81.4%	76.2 – 85.7	Virginia
60	Franklin County	81.4%	75.4 – 86.4	Massachusetts
61	Baltimore city	81.4%	77.0 – 85.4	Maryland
62	Erie County	81.3%	76.4 – 85.5	New York
63	Cumberland County	81.3%	76.6 – 85.2	Maine
64	Dorchester County	81.2%	75.6 – 86.0	Maryland
65	Carroll County	81.2%	75.3 – 86.1	Maryland
66	Penobscot County	81.2%	76.5 – 85.3	Maine
67	Sheboygan County	81.1%	75.2 – 86.1	Wisconsin
68	Bayfield County	81.1%	74.8 – 86.4	Wisconsin
69	Blue Earth County	81.1%	74.9 – 86.4	Minnesota
70	Hancock County	81.1%	75.4 – 85.4	Maine
71	Orleans Parish	81.1%	75.2 – 86.0	Louisiana
72	New Kent County	81.0%	74.6 – 86.8	Virginia
73	Hampton city	81.0%	75.4 – 85.9	Virginia
74	Chester County	81.0%	74.1 – 86.5	Pennsylvania
75	Currituck County	81.0%	73.8 – 86.4	North Carolina
76	Westchester County	81.0%	76.5 – 84.6	New York
77	Otter Tail County	81.0%	75.3 – 85.9	Minnesota
78	West Feliciana Parish	81.0%	74.4 – 86.9	Louisiana
79	Suffolk city	80.9%	74.4 – 86.4	Virginia
80	Powhatan County	80.9%	74.2 – 86.5	Virginia
81	Albemarle County	80.9%	75.0 – 85.7	Virginia
82	Vance County	80.9%	74.2 – 86.5	North Carolina
83	Nash County	80.9%	73.9 – 86.7	North Carolina
84	Hampden County	80.9%	75.3 – 85.6	Massachusetts
85	Louisa County	80.9%	77.2 – 84.9	Iowa
86	Montgomery County	80.9%	75.1 – 86.1	Alabama
87	Burnett County	80.8%	74.0 – 86.2	Wisconsin
88	Mercer County	80.8%	74.0 – 86.5	Pennsylvania
89	Traill County	80.8%	73.5 – 86.6	North Dakota
90	Merrimack County	80.8%	75.8 – 85.5	New Hampshire
91	Lucas County	80.8%	74.2 – 86.4	Iowa
92	Goochland County	80.7%	73.6 – 86.5	Virginia
93	Prince George's County	80.7%	76.6 – 84.6	Maryland
94	St. Tammany Parish	80.7%	75.0 – 85.5	Louisiana
95	Pocahontas County	80.7%	73.8 – 86.4	Iowa
96	Rockdale County	80.7%	74.1 – 86.0	Georgia
97	Autauga County	80.7%	73.6 – 86.4	Alabama
98	Washington County	80.6%	75.4 – 85.3	Rhode Island
99	New York County	80.6%	76.0 – 84.7	New York
100	Burlington County	80.6%	75.0 – 85.2	New Jersey

Lowest Mammography (women 50-74) Rates — Bottom 100 CountiesCounties with the lowest reported mammography (women 50-74) rates.

#	County	Rate	95% CI	State
1	Kusilvak Census Area	48.5%	38.6 – 58.8	Alaska
2	Bethel Census Area	57.2%	47.6 – 65.8	Alaska
3	San Juan County	57.6%	50.1 – 64.9	New Mexico
4	Apache County	58.0%	50.0 – 65.4	Arizona
5	Oglala Lakota County	58.2%	49.6 – 66.1	South Dakota
6	Fairbanks North Star Borough	58.4%	50.6 – 65.6	Alaska
7	Nome Census Area	58.7%	49.3 – 68.3	Alaska
8	Hughes County	58.8%	48.5 – 68.0	Oklahoma
9	Carbon County	60.1%	51.1 – 68.9	Wyoming
10	Big Horn County	60.4%	51.5 – 68.9	Wyoming
11	Lincoln County	60.5%	50.7 – 69.7	Idaho
12	Adair County	60.6%	51.1 – 70.0	Oklahoma
13	Canyon County	60.7%	53.1 – 67.0	Idaho
14	Platte County	60.8%	51.7 – 69.5	Wyoming
15	San Juan County	60.9%	51.4 – 69.6	Utah
16	Kenedy County	61.0%	54.6 – 67.8	Texas
17	Owyhee County	61.1%	51.2 – 70.3	Idaho
18	Kenai Peninsula Borough	61.3%	53.7 – 67.8	Alaska
19	Yavapai County	61.4%	54.5 – 68.0	Arizona
20	Mohave County	61.5%	54.4 – 68.5	Arizona
21	Dimmit County	61.6%	51.9 – 70.5	Texas
22	Duchesne County	61.6%	52.8 – 69.8	Utah
23	Ferry County	61.6%	53.0 – 70.0	Washington
24	Southeast Fairbanks Census Area	61.9%	53.6 – 69.9	Alaska
25	McKinley County	61.9%	52.0 – 70.0	New Mexico
26	Northwest Arctic Borough	62.1%	51.8 – 71.4	Alaska
27	Yukon-Koyukuk Census Area	62.2%	52.3 – 71.1	Alaska
28	Fremont County	62.2%	52.2 – 70.9	Idaho
29	Kiowa County	62.3%	57.4 – 66.8	Colorado
30	Presidio County	62.3%	52.2 – 70.8	Texas
31	Lake and Peninsula Borough	62.4%	52.4 – 71.2	Alaska
32	Catron County	62.4%	52.5 – 71.3	New Mexico
33	Sioux County	62.6%	52.2 – 71.6	North Dakota
34	Dillingham Census Area	62.7%	53.1 – 71.3	Alaska
35	Kootenai County	62.7%	55.2 – 69.6	Idaho
36	Grand County	62.7%	53.0 – 71.8	Utah
37	Aleutians East Borough	62.8%	53.0 – 71.6	Alaska
38	Kiowa County	62.8%	53.4 – 72.0	Oklahoma
39	Brooks County	62.8%	57.8 – 67.5	Texas
40	Cherokee County	62.9%	53.7 – 70.6	Oklahoma
41	Niobrara County	62.9%	53.3 – 71.8	Wyoming
42	Yakutat City and Borough	63.0%	53.5 – 72.1	Alaska
43	Navajo County	63.0%	56.0 – 69.8	Arizona
44	Fremont County	63.0%	55.4 – 70.5	Wyoming
45	Gila County	63.1%	56.1 – 69.7	Arizona
46	Lawrence County	63.1%	52.8 – 72.1	Illinois
47	La Salle County	63.1%	58.2 – 67.9	Texas
48	Uintah County	63.1%	53.7 – 71.7	Utah
49	Hamilton County	63.2%	54.5 – 71.5	Florida
50	Butte County	63.2%	53.5 – 72.3	Idaho
51	Magoffin County	63.2%	54.3 – 72.0	Kentucky
52	McIntosh County	63.2%	53.7 – 71.9	Oklahoma
53	Campbell County	63.2%	55.0 – 70.8	Wyoming
54	Franklin County	63.3%	53.3 – 72.3	Illinois
55	Wrangell City and Borough	63.4%	54.4 – 72.5	Alaska
56	Coconino County	63.4%	56.8 – 69.8	Arizona
57	Sierra County	63.4%	53.0 – 72.1	New Mexico
58	Haskell County	63.4%	53.5 – 72.7	Oklahoma
59	Boundary County	63.5%	54.5 – 71.8	Idaho
60	Idaho County	63.6%	54.8 – 72.0	Idaho
61	Butler County	63.6%	55.3 – 72.8	Missouri
62	Zavala County	63.6%	58.3 – 68.5	Texas
63	Stevens County	63.6%	56.4 – 69.9	Washington
64	Bent County	63.9%	54.4 – 72.6	Colorado
65	Otero County	63.9%	54.4 – 72.9	Colorado
66	Schuyler County	63.9%	54.9 – 73.5	Illinois
67	Seminole County	63.9%	54.4 – 72.7	Oklahoma
68	Cochise County	64.0%	56.5 – 71.1	Arizona
69	Montgomery County	64.0%	54.4 – 72.9	Arkansas
70	Green County	64.0%	54.3 – 73.1	Kentucky
71	Nowata County	64.0%	55.2 – 73.5	Oklahoma
72	Okmulgee County	64.0%	54.5 – 72.7	Oklahoma
73	Delaware County	64.1%	54.7 – 72.4	Oklahoma
74	Baca County	64.2%	54.2 – 73.1	Colorado
75	Hendry County	64.2%	54.8 – 73.0	Florida
76	Pulaski County	64.2%	55.1 – 72.4	Kentucky
77	Harding County	64.2%	54.9 – 73.1	New Mexico
78	Caddo County	64.2%	54.3 – 72.6	Oklahoma
79	Okfuskee County	64.2%	54.9 – 73.0	Oklahoma
80	Claiborne County	64.2%	54.6 – 73.1	Tennessee
81	Weston County	64.2%	54.8 – 72.3	Wyoming
82	Aleutians West Census Area	64.3%	55.6 – 73.7	Alaska
83	Power County	64.3%	54.4 – 73.4	Idaho
84	Whitley County	64.3%	55.5 – 73.4	Kentucky
85	Choctaw County	64.3%	54.5 – 73.1	Oklahoma
86	Woodward County	64.3%	55.0 – 73.1	Oklahoma
87	Matanuska-Susitna Borough	64.4%	57.6 – 70.8	Alaska
88	Prince of Wales-Hyder Census Area	64.4%	54.9 – 72.3	Alaska
89	Shoshone County	64.4%	54.8 – 72.8	Idaho
90	Johnson County	64.4%	55.3 – 73.5	Illinois
91	Columbia County	64.4%	55.6 – 72.2	Washington
92	Albany County	64.4%	55.7 – 72.3	Wyoming
93	Crowley County	64.6%	54.8 – 73.7	Colorado
94	Adams County	64.6%	55.1 – 73.6	Idaho
95	Washington County	64.6%	54.8 – 73.5	Idaho
96	Letcher County	64.6%	55.2 – 73.4	Kentucky
97	McDonald County	64.6%	54.9 – 73.6	Missouri
98	Sweetwater County	64.6%	56.0 – 72.3	Wyoming
99	Washakie County	64.6%	55.3 – 73.5	Wyoming
100	Sharp County	64.7%	55.1 – 73.5	Arkansas

What this ranking suggests

Mammography rates are a clean test of whether a county's primary-care system reaches its women in the recommended age window. Pair this ranking with the local hospital list on the county page — facility access drives a real share of the variance.

Methodology notes & limitations

Estimates are statistical model outputs, not direct measurements. Small counties have wider confidence intervals; treat narrow rank differences in those rows as within-noise. Counties where the underlying population is too small to support modeling are suppressed entirely (about 1% of US counties). All measures are age-adjusted to the 2000 US standard population. The PLACES dataset uses BRFSS self-reported data — self-report introduces known direction-of-bias in some measures (BMI is under-reported; binge drinking is under-reported), but the bias is roughly uniform across counties so ranking comparability is preserved. See the methodology page for full data-pipeline documentation.

By Logan Johnson, Founder & Data EditorPublished May 15, 2026Reviewed by Logan Johnson, Founder & Data Editor

Data source: CDC PLACES 2023 release. Measure ID: MAMMOUSE.

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