1,082,273 people (2024 Census estimate, +2.0% since 2020)
493 square miles of land · 2,195 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
6 active community water systems list Montgomery County in the area they serve, reporting 1,959,606 people served in all (a system that crosses county lines counts its whole population).
| WASHINGTON SUBURBAN SANITARY COMMISSION surface water · local government · MD0150005 | 1,900,000 served |
| CITY OF ROCKVILLE surface water · local government · MD0150003 | 52,000 served |
| TOWN OF POOLESVILLE groundwater (surface-influenced) · local government · MD0150002 | 6,005 served |
| FAIRLAND CROSSING APARTMENTS buys surface water · private · MD0150102 | 1,248 served |
| WHITLEY PARK CONDOMINIUMS buys surface water · private · MD0150101 | 256 served |
| COLUMBIA TOWERS buys surface water · private · MD0150103 | 97 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 923 people were held in Montgomery County's jail, in Vera's latest figure (2024), or 136 per 100,000 residents ages 15–64. In 2019 it was about 753.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
1 school district has its office in Montgomery County. School taxes are usually the largest part of a property tax bill.
Spent $3.7 billion — $3.1 billion to run schools, about $19,456 per student, plus $451.6 million on buildings and equipment. Money in: $2.5 billion local (mostly property tax), $1 billion state, $274.6 million federal. Long-term debt: $2.5 billion.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Montgomery County about $126.4 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
522 bridges in Montgomery County: 205 in good condition, 292 fair, and 25 poor (4.8%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| CLARA BARTON PARKW over CLARA BARTON PARKWAY (SB · built 1959 | 40,057 vehicles a day |
| FATHER HURLEY BOUL over LITTLE SENECA CREEK TRIB · built 1995 | 33,220 vehicles a day |
| WEST GUDE DRIVE over I-270 · built 1985 | 30,343 vehicles a day |
| TUCKERMAN LANE over SNAKEDEN BRANCH · built 1966 | 19,882 vehicles a day |
| SHADY GROVE RD EB over CSXT RAILROAD · built 1976 | 19,679 vehicles a day |
| SEVEN LOCKS ROAD over CABIN JOHN CREEK TRIBUTA · built 1965 | 18,184 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $1.2 billion of work in Montgomery County in fiscal 2025, about $1,091 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for Maryland are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Montgomery County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Montgomery County built: brayden.ozark@gmail.com.
More of Maryland: the state government and every county in Maryland.
Nearby counties: Howard County (17 mi) · Falls Church city, VA (17 mi) · Arlington County, VA (19 mi) · District of Columbia, DC (19 mi) · Fairfax city, VA (20 mi) · Fairfax County, VA (22 mi).