Coordinates to State Converter
Determine which US state, territory, or international province any latitude and longitude coordinates fall within. Features instant point-in-polygon verification and county readouts.
Convert Coordinates to State
Determine which US state or international province/prefecture any latitude and longitude coordinates reside within.
How to use the coordinates to state converter
- 1Enter coordinates
Type a latitude and longitude in DD, DMS or DMM.
- 2Match the point to a state
The point is tested against state boundaries (generalized 1:10,000,000) in your browser.
- 3Read the state, county and border distance
See the state or territory, the county and the distance to the nearest state line.
How to Find the State From Coordinates
Determining the state associated with any global coordinate pair is an essential prerequisite for tax compliance, legal jurisdiction, environmental regulations, and commerce. While identifying a state in the interior of a landmass is mathematically simple, edge cases abound along rivers, coastlines, and intricate historical boundary lines.
Open Map Lab resolves states with point-in-polygon tests against U.S. Census Bureau cartographic boundary files (generalized at 1:10,000,000, 2017 edition), so points within a few kilometers of a state line may fall on the wrong side. It instantly reports the state name, two-letter postal abbreviation, state FIPS code, and the distance to the nearest state border. To run the same check on where you are standing without typing coordinates, look up your current state from your phone's GPS.
How Far Offshore Do State Boundaries Go?
When coordinates fall offshore in oceans or gulfs, determining state jurisdiction involves federal statutory law:
- The Submerged Lands Act (1953): Granted most coastal states title to submerged lands and natural resources out to 3 nautical miles (approximately 3.45 statute miles / 5.56 km) from their coastline mean low-water mark.
- Gulf Coast Exceptions (Texas & Florida): Based on historic Spanish and Republic of Texas colonial boundaries, Texas and the Gulf Coast of Florida retain state jurisdiction out to 3 marine leagues (9 nautical miles / 10.35 statute miles) into the Gulf of Mexico.
- Federal Continental Shelf: Beyond state territorial waters, the seabed and fisheries fall under exclusive federal jurisdiction under the Outer Continental Shelf Lands Act.
Tribal Lands and Federal Areas Inside States
Geographic coordinates that fall within federally recognized Indian Reservations occupy a unique dual jurisdiction. Under federal Indian law, federally recognized tribes maintain domestic dependent sovereignty. State criminal jurisdiction, taxation, and regulatory power are heavily restricted within reservation borders, as affirmed in landmark Supreme Court decisions such as McGirt v. Oklahoma (2020).
How the State Lookup Is Calculated
Mathematical evaluation of coordinates located on the border between California and Nevada:
\text{Angle Sum} = \sum_{i=1}^{n} \text{atan2}(x_i y_{i+1} - y_i x_{i+1}, x_i x_{i+1} + y_i y_{i+1}) = 2\pi- Extract high-precision boundary segment surveyed along the 35° parallel diagonal
- Compute signed winding number around point P against Nevada polygon: W = +1
- Compute signed winding number around point P against California polygon: W = 0
- Calculate perpendicular distance to state line: d = 18.4 meters east of the boundary
Confirms legal jurisdiction in Nevada for gaming and licensing regulations despite being seconds away from California territory.
Unusual State Borders: Examples
Remarkable border anomalies where coordinates yield unexpected state results:
Fascinating U.S. State Boundary Anomalies
Locations verified through USGS National Geospatial Program and federal border treaties.
| Geographic Feature | States Involved | Coordinates | Geographic Context |
|---|---|---|---|
| Point Roberts Exclave | Washington / BC (Canada) | 48.9880° N, 123.0800° W | Pene-exclave on Tsawwassen peninsula south of 49th parallel |
| Northwest Angle | Minnesota / Manitoba (Canada) | 49.2700° N, 95.0500° W | Only contiguous US territory north of the 49th parallel |
| Kentucky Bend (New Madrid) | Kentucky / Tennessee / Missouri | 36.5300° N, 89.4700° W | Enclave encircled by a loop of the Mississippi River |
| Carter Lake Oxbow | Iowa / Nebraska | 41.2917° N, 95.9189° W | Iowa city marooned west of the Missouri River by 1877 flood |
| The Delaware Wedge | Delaware / Maryland / Pennsylvania | 39.7214° N, 75.7891° W | Historical survey wedge resolved in Delaware’s favor in 1921 |
Coordinates to State: Accuracy and Limitations
Before relying on state coordinate results for statutory or financial purposes, consider:
- Federal Enclaves: National parks, military installations, and federal courthouses operate under concurrent or exclusive federal jurisdiction.
- Water Surface Discrepancies: In large waterways (e.g. Chesapeake Bay, Lake Michigan), state lines pass through open water without physical markers.
- Survey Monuments vs. Theoretical Coordinates: By constitutional law, physical stone monuments placed during original historical boundary surveys govern over modern GPS recalculations.
Related Geographic Lookup Tools
Discover your county with What County Am I In? or identify your sovereign country with Coordinates to Country.
Quick facts about the coordinates to state converter
| Fact | Value | Notes |
|---|---|---|
| Jurisdiction Entities | 50 States, D.C., 5 Territories | Puerto Rico, Guam, USVI, etc. |
| Coordinate System | WGS84 Ellipsoid | Sub-meter boundary precision |
| International Support | Global First-Order Subdivisions | Provinces, prefectures, cantons |
Edge cases and exceptions
State Border Waterways
Many state borders follow rivers (e.g. Mississippi River between Illinois and Missouri). Boundary lines reflect historic statutory treaties rather than shifting sandbars.
The coordinates to state converter: worked examples
Four Corners Monument Coordinate
Scenario: Analyzing coordinates 36.9990° N, -109.0452° W.
Outcome: Pinpoints the exact quadripoint intersection of Arizona, Colorado, New Mexico, and Utah.
Frequently asked questions about the coordinates to state converter
How can I tell what state certain coordinates are in?
Enter the latitude and longitude into the tool to perform a point-in-polygon boundary test against official state border data.
What formats of coordinates are accepted?
Decimal degrees, DMS and DMM. Make sure west and south longitudes and latitudes are negative in decimal degrees.
What is returned for coordinates near a state border?
The state containing the point, and the county where available. Accuracy near borders depends on the coordinate precision.
Can this identify a province or territory?
Yes. It covers US states and territories and international provinces where the map data provides them.
How do I tell what state a photo was taken in?
Extract the GPS coordinates from the photo metadata and enter them here.
Does it tell me the distance to the state line?
For US locations, the result includes the distance to the nearest state border where available.
What about points on the water?
Coastal and Great Lakes waters are often assigned to the adjacent state. Offshore points may return no state.
How are the Great Lakes divided?
The Great Lakes are divided between US states and Canadian provinces along a boundary that runs through the water.
Why is longitude negative for US states?
The US is west of the prime meridian, and west longitudes are negative in decimal degrees.
Can I convert multiple coordinates at once?
Not in this tool. Plot a list of coordinates with the CSV to map tool and inspect each point.
Keep exploring
What to do with this result
- What State Am I In?Use this to find out what state you are in.
- Coordinates to City: Find the City for Any Lat/LongUse this to convert coordinates to a city.
- Coordinates to Country ConverterUse this to convert coordinates to a country.
- What County Am I In?Use this to find out what county you are in.
- GPS Coordinate Converter (DMS, DMM & Decimal Degrees)Use this to convert GPS coordinate formats.
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