852,425 people (2024 Census estimate, −0.1% since 2020)
598 square miles of land · 1,425 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.
8 active community water systems list Baltimore County in the area they serve, reporting 2,463 people served in all (a system that crosses county lines counts its whole population).
| STELLA MARIS buys surface water · private · MD0030212 | 873 served |
| GLEN MEADOWS RETIREMENT COMMUNITY groundwater (surface-influenced) · private · MD0030208 | 468 served |
| SUNNYBROOK groundwater · local government · MD0030011 | 416 served |
| ELKRIDGE ESTATES OF ROLAND PARK buys surface water · private · MD0030018 | 414 served |
| CHAPEL HILL NURSING CENTER groundwater · private · MD0030202 | 125 served |
| GRANITE MOBILE HOME PARK groundwater · private · MD0030204 | 96 served |
| GRAMERCY LLC (AKA KOINONIA PARTNERSHIP ) groundwater · private · MD0030023 | 40 served |
| PHOENIX groundwater · local government · MD0030017 | 31 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 917 people were held in Baltimore County's jail, in Vera's latest figure (2024), or 171 per 100,000 residents ages 15–64. In 2019 it was about 1,121.
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 Baltimore County. School taxes are usually the largest part of a property tax bill.
Spent $2.4 billion — $2.1 billion to run schools, about $18,666 per student, plus $230.6 million on buildings and equipment. Money in: $1.1 billion local (mostly property tax), $1.1 billion state, $281.8 million federal. Long-term debt: $619.7 million.
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 Baltimore County about $157.1 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
786 bridges in Baltimore County: 236 in good condition, 528 fair, and 22 poor (2.8%). “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.
| ROSSVILLE BOULEVAR over AMTRAK RAILROAD AND OREM · built 1971 | 20,575 vehicles a day |
| OLD COURT ROAD over GWYNNS FALLS AND MTA MET · built 1961 | 16,498 vehicles a day |
| PUTTY HILL AVENUE over IS 695 · built 1961 | 12,400 vehicles a day |
| PENINSULA EXPRESSW over CSX RAILROAD · built 1960 | 11,183 vehicles a day |
| PENINSULA EXPRESSW over CSX RAILROAD · built 1960 | 11,183 vehicles a day |
| KING AVENUE over TRIBUTARY TO WHITE MARSH · built 1978 | 8,126 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $796.6 million of work in Baltimore County in fiscal 2025, about $932 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 Baltimore 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 Baltimore County built: brayden.ozark@gmail.com.
More of Maryland: the state government and every county in Maryland.
Nearby counties: Baltimore city (10 mi) · Harford County (18 mi) · Howard County (21 mi) · Carroll County (23 mi) · Kent County (30 mi) · Anne Arundel County (31 mi).