Digital Radiation

U.S. Census Bureau · 2025 Population Estimates Program (PEP)

Maryland County Population — 2025 PEP

July 1, 2025 resident population estimates for 24 counties. State total (sum of these county estimates): 6,265,347 persons.

Separate 2025 TIGER/Line county boundaries validate county identity; these are not ACS 2024 survey estimates.

Official Vintage 2025 county identities and unsimplified TIGER coordinates; separate-period ACS housing is joined only by exact full GEOID. Original 2020 counts require separately evidenced compatible geography; incompatible observations remain null with reasons. The revised April estimates base is not an original census count; no boundary allocation is invented.

Source and downloads

2025 Census PEP county estimates, 2020–2025 series; counts are persons, migration counts are persons, published rates are per 1,000, and unavailable values remain null (not zero). 2020 rates are unavailable for the partial-year interval. County totals and characteristics are verified against the pinned raw Census CSV receipts and independent 2025 county geometry.

Official Census PEP county source · Download JSON · Download CSV · Download source metadata

Official state totals and county summaries

Official NST July 1, 2025 state total: 6,265,347 persons (SUMLEV 040, PEP Vintage 2025). County sum: 6,265,347 persons; comparison status: equal.

Official NST July 2020: 6,178,387 persons; July 2020–July 2025 change: +86,960 persons; growth: 1.407487 percent (denominator: official July 2020 population).

County July 2024–July 2025: Growing: 17 · Shrinking: 7 · Unchanged: 0 · Missing: 0. Median county growth: 0.277700 percent.

Largest county: Montgomery County (GEOID 24031): 1074582 persons.

Fastest county growth: Queen Anne's County (GEOID 24035): 1.428811 percent.

Greatest numeric increase: Prince George's County (GEOID 24033): 5778 persons.

no minimum population; missing excluded per measure; median of county percentages, not population weighted; equal values use ascending full GEOID.

Official state demographics

Resident population · SUMLEV 040 · July 1, 2025 · Census PEP Vintage 2025. Denominator for every share: 6,265,347 resident persons. Six exclusive race groups; Hispanic origin overlaps race and must not be added to it. Release: June 2026; exact day unproved; PEP estimates have no ACS sampling MOE.

Scroll horizontally to see Count and Share. Keyboard: focus this table region and use Left and Right arrow keys.

Official state age, sex, race and overlapping Hispanic origin
MeasureCountShare
Female3,251,961 persons51.903925 percent
Male3,013,386 persons48.096075 percent
Ages 18–24549,048 persons8.763250 percent
Ages 25–441,689,833 persons26.971100 percent
Ages 45–641,539,740 persons24.575494 percent
Ages 65 and older1,149,859 persons18.352679 percent
Under 181,336,867 persons21.337477 percent
American Indian or Alaska Native alone103,179 persons1.646820 percent
Asian alone474,402 persons7.571839 percent
Black or African American alone1,948,063 persons31.092659 percent
Native Hawaiian or other Pacific Islander alone6,420 persons0.102468 percent
Two or more races325,055 persons5.188140 percent
White alone3,408,228 persons54.398072 percent
Hispanic (any race)863,927 persons13.788973 percent
Not Hispanic5,401,420 persons86.211027 percent

Official state median age: 39.8 years. Published state SYASEX median age; not a county aggregation, not ACS.

Download all state demographic observations (CSV)

Revised April 1, 2020 estimates base (official NST): 6,181,640 persons; county base sum: 6,181,640 persons; comparison: equal. This is not the original decennial census count.

Original April 1, 2020 Census count: 21 compatible counties; 3 unavailable. Published Census county centers-of-population POPULATION, original 2020 Gazetteer and official 2020–2025 geographic-change evidence; no boundary allocation. Original count, revised April estimates base and July 2020 estimate are separate observations. Documentation: November 2021; exact file release day unproved; retrieval is not release. Official original count source. Original 2020 Gazetteer identity plus Census geographic-change notes 2014–2025; no county-level change recorded from 2020 onward, exact full modern name, and original count required. Any recorded county-level change or referenced counterparty is conservatively unavailable, including unresolved internal redistricting. Same GEOID alone is insufficient. Not a claim of identical cartographic coordinates; no invented allocations.

Source release date unavailable: retained pins do not attest an official release date; retrieval is not release. Reference dates and Vintage 2025 are explicit; no current-vintage refresh is implied.

County population and demographic explorer

Choose a measure, observation year and county without downloading boundaries. Rankings, search, trends and CSV work without a map. Load map explicitly to download the full, unsimplified 2025 TIGER boundaries; this defers rather than removes their payload. The table remains available without JavaScript.

PEP population · persons · July 1, 2025. Denominator: none. Calculation/source: CO POPESTIMATEy. Vintage 2025; null with metric_status reason; measured zero remains zero; no imputation.

Loading county controls; static rankings available below…

Map not loaded. County controls and rankings do not require boundaries.

After loading, Tab to a county and press Enter or Space; colors and the legend indicate signed direction and magnitude. Outlines show selection. The county picker works before and after map loading.

Selected county demographic breakdown

July 1, 2025 · Montgomery County (GEOID 24031). Same-period county population is the share denominator. Hispanic origin overlaps race; do not add origin to race counts. Other overlapping classifications are not additive. Official county median age is from PEP AGESEX MEDIAN_AGE_TOT, not ACS.

County demographics: counts, shares and official median age
Classification / sourceCount or statisticShare / status
Sex · PEP male515,407 persons47.963487 percent
Sex · PEP female559,175 persons52.036513 percent
Age bands · PEP under18235,614 persons21.926107 percent
Age bands · PEP age18 2486,010 persons8.004043 percent
Age bands · PEP age25 44277,708 persons25.843351 percent
Age bands · PEP age45 64274,185 persons25.515503 percent
Age bands · PEP age65plus201,065 persons18.710996 percent
Race alone (partition) · PEP white alone584,070 persons54.353228 percent
Race alone (partition) · PEP black alone225,337 persons20.969735 percent
Race alone (partition) · PEP aian alone25,356 persons2.359615 percent
Race alone (partition) · PEP asian alone177,319 persons16.501207 percent
Race alone (partition) · PEP nhpi alone1,065 persons0.099108 percent
Race alone (partition) · PEP two or more61,435 persons5.717107 percent
Hispanic origin (overlaps race) · PEP hispanic any race236,344 persons21.994040 percent
Hispanic origin (overlaps race) · PEP not hispanic838,238 persons78.005960 percent
Other overlapping classifications (not additive) · PEP white alone or combination639,319 persons59.494669 percent
Other overlapping classifications (not additive) · PEP not hispanic white alone419,329 persons39.022522 percent
Official county median age · AGESEX MEDIAN_AGE_TOT40.9 yearsNot a share; not ACS or an average of county medians

Use Ctrl/Command or Shift to select multiple counties. The following trend uses exact resident persons, not percentages; county size affects the scale. Missing observations break lines; the revised April estimates base is a separate dashed partial interval.

2025 county population rankings

All 24 county estimates are present without JavaScript, ranked by 2025 population (largest first). Signed changes compare July 1, 2024 to July 1, 2025. Unavailable is not zero; equal values break ties by GEOID (ascending).

Showing all 24 counties; ranked by 2025 population, descending.

Maryland County Population — 2025 PEP — July 1, 2025; rank reflects the selected ordering
RankCountyGEOIDPopulation (persons)Signed change (persons)Signed change (percent)
1Montgomery County240311,074,582+1537 persons+0.143237%
2Prince George's County24033970,374+5778 persons+0.599007%
3Baltimore County24005847,650-788 persons-0.092877%
4Anne Arundel County24003603,380+2239 persons+0.372458%
5Baltimore city24510569,997-56 persons-0.009824%
6Howard County24027339,183+1388 persons+0.410900%
7Frederick County24021302,883+4028 persons+1.347811%
8Harford County24025266,446+822 persons+0.309460%
9Carroll County24013176,677-113 persons-0.063918%
10Charles County24017176,593+2094 persons+1.200007%
11Washington County24043157,731+591 persons+0.376098%
12St. Mary's County24037116,692+476 persons+0.409582%
13Cecil County24015107,131+564 persons+0.529245%
14Wicomico County24045106,899+260 persons+0.243813%
15Calvert County2400994,484-137 persons-0.144788%
16Allegany County2400166,848-136 persons-0.203034%
17Worcester County2404754,459+78 persons+0.143432%
18Queen Anne's County2403554,448+767 persons+1.428811%
19Talbot County2404138,238-57 persons-0.148844%
20Caroline County2401134,116+57 persons+0.167357%
21Dorchester County2401933,628+420 persons+1.264755%
22Garrett County2402328,370-47 persons-0.165394%
23Somerset County2403924,973+220 persons+0.888781%
24Kent County2402919,565+48 persons+0.245939%

County population trend · 2020–2025

Resident population (persons), not ACS housing. April 1, 2020 estimates base is distinct from the July 1, 2020 estimate. The April–July 2020 change is partial-year; the July 2020–July 2021 interval is the first July-to-July comparison. No 2020 annual rate is shown. Missing observations are unavailable, never zero.

Showing Montgomery County (GEOID 24031). Select a county on the map or in the rankings table to update this trend.

Horizontal axis: year (2020–2025); vertical axis: resident population (persons). The 2020 base is a separate April 1 observation; July 1 estimates run from 2020 through 2025. Focus the chart viewport and use Left/Right arrows to scroll on narrow screens. Complete axis labels stay here outside the scrolling chart; the table gives exact values and availability.

Population observations for Montgomery County (GEOID 24031), persons
DatePopulation (persons)Interval
April 1, 2020 base1,062,079Estimates base; not July 1
July 1, 20201,060,926April–July partial-year; no annual rate
July 1, 20211,055,869July 2020–July 2021 comparison
July 1, 20221,058,546July-to-July estimate
July 1, 20231,064,369July-to-July estimate
July 1, 20241,073,045July-to-July estimate
July 1, 20251,074,582July-to-July estimate

County population and median home value · different vintages

Each point pairs a county’s PEP July 1, 2025 resident population (persons) with its ACS 2024 5-year median owner-occupied home value (B25077, U.S. dollars). These are different reference periods and different statistical programs. This descriptive comparison does not imply causality or matched vintages. Suppressed, missing or invalid ACS estimates are unavailable, not zero and not plotted. A valid zero remains zero.

The exact-value table below works without JavaScript; chart loading requires JavaScript.

Select a county using the map or rankings to coordinate the comparison.

County comparison: PEP July 1, 2025 population (persons) and ACS 2024 5-year median owner-occupied home value (U.S. dollars); unavailable values identified
CountyGEOIDPEP July 1, 2025 population (persons)ACS 2024 5-year median home value (U.S. dollars)
Allegany County2400166,848$154,900
Anne Arundel County24003603,380$467,900
Baltimore County24005847,650$349,300
Calvert County2400994,484$460,200
Caroline County2401134,116$290,100
Carroll County24013176,677$434,000
Cecil County24015107,131$343,400
Charles County24017176,593$428,500
Dorchester County2401933,628$262,400
Frederick County24021302,883$464,600
Garrett County2402328,370$235,300
Harford County24025266,446$386,400
Howard County24027339,183$597,900
Kent County2402919,565$330,900
Montgomery County240311,074,582$640,300
Prince George's County24033970,374$426,000
Queen Anne's County2403554,448$462,700
St. Mary's County24037116,692$407,600
Somerset County2403924,973$173,200
Talbot County2404138,238$409,700
Washington County24043157,731$296,100
Wicomico County24045106,899$254,700
Worcester County2404754,459$374,700
Baltimore city24510569,997$229,600