County Map with Cities
View US county boundaries with all incorporated cities and major towns plotted and labeled.
The County Map with Cities tool provides an interactive geographic map connecting all 3,143 US counties and county-equivalents to their official county seats and constituent incorporated cities. Featuring ANSI INCITS 31:2009 5-digit FIPS codes, land areas, population density metrics, and complete municipal directories across all 50 states, the tool supports instant search, county spotlights, and CSV spreadsheet exports.
County Map with Cities
Explore all 3,143 US counties alongside their official county seats and constituent incorporated cities across all 50 states.
In current filter view
Incorporated municipal centers
Sum of constituent counties
residents per county
Los Angeles County
California · FIPS Code: 06037
US Counties Directory with Incorporated Municipalities (14)
ANSI INCITS 31:2009 official FIPS codes, county seats, and populated municipalities
| County Name | State | FIPS | County Seat | Population | Land Area | Cities Inside | Actions |
|---|---|---|---|---|---|---|---|
| Los Angeles County | CA | 06037 | Los Angeles | 9,721,138 | 4,058 sq mi | 3 cities | |
| San Diego County | CA | 06073 | San Diego | 3,276,208 | 4,207 sq mi | 2 cities | |
| Orange County | CA | 06059 | Santa Ana | 3,151,184 | 791 sq mi | 3 cities | |
| Riverside County | CA | 06065 | Riverside | 2,458,395 | 7,206 sq mi | 1 cities | |
| San Bernardino County | CA | 06071 | San Bernardino | 2,181,654 | 20,057 sq mi | 1 cities | |
| Santa Clara County | CA | 06085 | San Jose | 1,877,592 | 1,290 sq mi | 2 cities | |
| Alameda County | CA | 06001 | Oakland | 1,628,997 | 739 sq mi | 3 cities | |
| Sacramento County | CA | 06067 | Sacramento | 1,585,055 | 965 sq mi | 1 cities | |
| Contra Costa County | CA | 06013 | Martinez | 1,155,677 | 716 sq mi | 1 cities | |
| Fresno County | CA | 06019 | Fresno | 1,015,190 | 5,958 sq mi | 1 cities | |
| San Francisco County | CA | 06075 | San Francisco | 808,437 | 47 sq mi | 1 cities | |
| Ventura County | CA | 06111 | Ventura | 832,605 | 1,843 sq mi | 1 cities | |
| San Joaquin County | CA | 06077 | Stockton | 779,233 | 1,391 sq mi | 1 cities | |
| Kern County | CA | 06029 | Bakersfield | 909,235 | 8,132 sq mi | 1 cities |
The United States is divided into 3,143 primary administrative counties and county-equivalents (including Louisiana parishes, Alaska boroughs, and independent cities in Virginia, Maryland, Missouri, and Nevada). Within each county, municipal corporations operate as incorporated cities, towns, and villages under state charter.
Counties & Cities Technical Specifications & Standards
WGS84 (EPSG:4326)
Standard global ellipsoidal coordinate reference system
ANSI Geodesics
Authoritative 5-digit federal FIPS alignment; coordinate centroids mapped with sub-arcsecond accuracy
GeoJSON · KML · CSV · SVG
Compatible with QGIS, ArcGIS, Google Earth & CAD
100% Client-Side
Calculations run in-browser. Zero coordinate logging.
How to Use the County Map with Cities
Follow this step-by-step procedure to execute precise spatial measurements and export results.
- 1Filter by US State or Nationwide Directory: Choose a specific US state (e.g. California, Texas, Florida, Illinois, New York) from the state dropdown, or select "All United States" to browse the complete national directory.
- 2Search by County, City Name, or FIPS Code: Use the keyword search bar to instantly find any county by name, official county seat, incorporated city name, or 5-digit FIPS code.
- 3Inspect County Profile & Constituent Cities: Click any county in the table or on the map to open the County Spotlight inspector, revealing population, land area, official county seat, and a complete directory of cities inside.
- 4Export Data to CSV or Copy County Profile: Click "Export CSV" to download an itemized spreadsheet of all counties and constituent municipalities, or click "Copy Profile" for direct inclusion in reports.
Geodesic Precision vs. Competitor Mapping Approaches
Most legacy mapping utilities (such as CalcMaps and FreeMapTools) rely on planar Web Mercator projections or spherical approximations, causing significant mathematical distortion at higher latitudes. GeoMap Suite computes exact ellipsoidal geodesics on the WGS84 reference ellipsoid.
| Calculation Model | Mathematical Basis | Distortion on WGS84 | Standard Tools | Practical Application |
|---|---|---|---|---|
| Planar (Web Mercator) | Cartesian dx² + dy² | 10% to 200%+ error | CalcMaps / Simple map tools | Distorts drastically away from equator. Inaccurate for true distance. |
| Spherical Great-Circle | Haversine (R = 6,371 km) | Up to 0.5% (~5 km/1,000 km) | Basic Google Maps wrappers | Ignores Earth's polar flattening. Reasonable for rough estimates. |
| GeoMap Suite Ellipsoidal | Karney Direct/Inverse WGS84 | < 15 nanometers (<0.0001%) | GeoMap Suite | Geodetic surveying, maritime, flight paths & legal boundary analysis. |
Southern California Municipal Hub: Los Angeles County, CA (FIPS 06037)
A state transportation planner inspects the constituent cities and administrative seat of the most populous county in the United States.
Input Parameters
- State
- California (CA)
- County Name
- Los Angeles County
- FIPS Code
- 06037
Computed Outputs
- Total County Population
- 9,861,707 Residents
- Official County Seat
- Los Angeles, CA
- Land Area
- 4,058 sq miles (10,510 sq km)
- Incorporated Municipalities
- 88 Incorporated Cities
Step-by-Step Mathematical Process
- Select California from the state directory.
- Locate Los Angeles County (FIPS 06037, Seat: Los Angeles).
- Plot municipal centroids on the interactive basemap (Los Angeles, Long Beach, Glendale, Pasadena, Santa Clarita, Torrance).
- Inspect population totals and land area distribution.
Midwestern Urban & Suburban Core: Cook County, IL (FIPS 17031)
A regional commercial property assessor reviews municipal boundaries and county seat jurisdiction in northeastern Illinois.
Input Parameters
- State
- Illinois (IL)
- County Name
- Cook County
- FIPS Code
- 17031
Computed Outputs
- Total Population
- 5,275,541 Residents
- County Seat
- Chicago, IL
- Land Area
- 945 sq miles (2,448 sq km)
- Population Density
- 5,582.6 people / sq mi
Step-by-Step Mathematical Process
- Filter state directory to Illinois.
- Select Cook County (FIPS 17031).
- Inspect official county seat (Chicago) and major surrounding municipalities (Evanston, Cicero, Arlington Heights, Schaumburg).
- Export structured CSV table for tax assessment record filing.
Understanding Your Results & Practical Interpretation
County Seats vs. Incorporated Cities
A county seat is the designated administrative center of a county hosting the courthouse, county commissioner offices, and public records. A county may contain multiple incorporated cities in addition to its official seat.
5-Digit ANSI INCITS FIPS Identification
Every county in the United States has a unique 5-digit FIPS code (e.g. 06037 for Los Angeles County, CA or 48201 for Harris County, TX), essential for real estate tax records, federal grants, and GIS mapping.
Independent Cities and Parishes
In Louisiana, counties are called Parishes; in Alaska, they are Boroughs. In Virginia, 38 independent cities exist outside of any county structure and are classified as county-equivalents by the federal government.
CSV Spreadsheet Export
The "Export CSV" button outputs a clean tabular dataset containing state names, county names, FIPS codes, county seats, population, land area, and a complete semicolon-delimited list of all constituent cities.
Practical Applications & Real-World Use Cases
Commercial Real Estate, Property Tax & Title Search
Verify legal county jurisdictions, county seats, tax assessment districts, and municipal zoning boundaries for commercial and residential properties.
Logistics, Fleet Routing & Sales Territory Management
Assign regional sales territories and delivery routes along county lines while keeping all constituent municipal cities under the appropriate regional hub.
Legal, Judicial & Public Safety Jurisdiction
Identify proper court filing venues, sheriff department service areas, and municipal police jurisdictions across county borders.
Mathematical Methodology & Geodetic Accuracy
ANSI INCITS 31:2009 Standards & US Census TIGER/Line Geography
County boundaries and municipal relationships are standardized according to the ANSI INCITS 31:2009 standard for Federal Information Processing Series (FIPS) Codes. Each county is indexed by a 5-digit identifier (2-digit state code + 3-digit county code) mapped to incorporated municipal places from the US Census Bureau Incorporated Places and Minor Civil Divisions directory.
\text{FullFIPS} = \text{StateFIPS}_{\text{2-digit}} \parallel \text{CountyFIPS}_{\text{3-digit}} \quad \text{Density} = \frac{\text{Population}}{\text{Land Area (sq mi)}}Limitations & Boundary Conditions
- •Some large metropolitan cities (such as New York City, Dallas, and Oklahoma City) cross multiple county boundaries; city listings reflect the primary county assignment.
- •Virginia independent cities, Baltimore City, St. Louis City, and Carson City operate as independent county-equivalents without separate parent counties.
- •Unincorporated communities and census-designated places without municipal charters are administered by county governments.
Troubleshooting & Geographic Edge Cases
Why do some cities cross county lines?
Cities like New York City (spanning 5 counties/boroughs), Dallas (spanning Dallas, Collin, Denton, Kaufman, and Rockwall counties), and Kansas City cross multiple county borders. Our database indexes them by their primary county center.
How do I filter the map to only show a single state?
Use the "Filter by US State" dropdown above the search bar to select any state. The map and data table will immediately zoom and filter to that state’s counties.
What is the gold star icon in the table and map?
The gold star icon denotes the official county seat where the county courthouse and administrative headquarters are located.
Can I export county and city lists for my GIS software?
Yes. Click the "Export CSV" button at the top right to download an RFC-4180 compliant spreadsheet ready for import into ArcGIS, QGIS, Excel, or Google Sheets.
Frequently Asked Questions
A county map with cities is an interactive cartographic and demographic tool that displays US county boundaries alongside all incorporated municipal cities, towns, and official county seats.