213,730 people (2024 Census estimate, +2.3% since 2020)
574 square miles of land · 373 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.
35 active community water systems list Harrison County in the area they serve, reporting 185,686 people served in all (a system that crosses county lines counts its whole population).
| CITY OF GULFPORT groundwater · local government · MS0240003 | 75,056 served |
| CITY OF BILOXI groundwater · local government · MS0240001 | 23,310 served |
| CITY OF LONG BEACH groundwater · local government · MS0240005 | 18,514 served |
| DIBERVILLE W/S groundwater · local government · MS0240002 | 12,721 served |
| CITY OF PASS CHRISTIAN groundwater · local government · MS0240009 | 10,436 served |
| CITY OF BILOXI-NORTH groundwater · local government · MS0240084 | 9,858 served |
| KEESLER AIR FORCE BASE groundwater · federal · MS0240049 | 8,006 served |
| CITY OF BILOXI-FRENCH groundwater · local government · MS0240036 | 4,968 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 765 people were held in Harrison County's jail, in Vera's latest figure (2024), or 569 per 100,000 residents ages 15–64. In 2019 it was about 817.
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.
5 school districts have their office in Harrison County. School taxes are usually the largest part of a property tax bill.
Spent $197.1 million — $162.3 million to run schools, about $11,305 per student, plus $31.9 million on buildings and equipment. Money in: $62.1 million local (mostly property tax), $84.7 million state, $48.1 million federal. Long-term debt: $70.9 million.
Spent $83.2 million — $72 million to run schools, about $11,784 per student, plus $10 million on buildings and equipment. Money in: $31.4 million local (mostly property tax), $38.1 million state, $20.5 million federal. Long-term debt: $37.3 million.
Spent $92.1 million — $76.8 million to run schools, about $13,206 per student, plus $13.3 million on buildings and equipment. Money in: $38.8 million local (mostly property tax), $34.3 million state, $16 million federal. Long-term debt: $59.9 million.
Spent $37.3 million — $32.2 million to run schools, about $11,009 per student, plus $4 million on buildings and equipment. Money in: $10.2 million local (mostly property tax), $25.3 million state, $6.7 million federal. Long-term debt: $23.7 million.
Spent $33.1 million — $27.5 million to run schools, about $14,145 per student, plus $5.4 million on buildings and equipment. Money in: $14.6 million local (mostly property tax), $11.5 million state, $7 million federal. Long-term debt: $7.8 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 High compared with other U.S. counties. FEMA estimates natural hazards cost Harrison County about $154.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
302 bridges in Harrison County: 159 in good condition, 126 fair, and 17 poor (5.6%). “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.
| POPPS FERRY ROAD over BACK BAY BILOXI · built 1979 | 18,000 vehicles a day |
| CEDAR LAKE RD over TCHOUTACABOUFFA RIVER · built 1973 | 6,000 vehicles a day |
| OLD HWY 67 over HOWARD CREEK · built 1960 | 5,200 vehicles a day |
| E. WORTHAM RD over FLAT BRANCH · built 1978 | 5,100 vehicles a day |
| FAS 109 LANDON RD over TAYLOR CREEK BRANCH · built 1955 | 4,300 vehicles a day |
| WOOLMARKET RD over PARKER CREEK · built 1964 | 4,000 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $186.5 million of work in Harrison County in fiscal 2025, about $894 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 Mississippi 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 Harrison 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 Harrison County built: brayden.ozark@gmail.com.
More of Mississippi: the state government and every county in Mississippi.
Nearby counties: Hancock County (24 mi) · Stone County (26 mi) · Jackson County (27 mi) · St. Bernard Parish, LA (36 mi) · Pearl River County (39 mi) · George County (40 mi).