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New Jersey · County atlas

Mercer County map

Explore the boundary, see its place in New Jersey, and download a map for your next project.

FIPS 340212025 Census boundariesFree PDF · PNG · SVG
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Boundary map 100%
Boundary map of Mercer County, New Jersey Mercer County
2025 U.S. Census boundaries. Detailed county outline. Zoom or expand for a closer look.
224.5 sq miLand area
4.4 sq miWater area
1.9%Share of area that is water
34021Five-digit county FIPS code

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Choose a format for printing, editing, or sharing. All downloads are free.

SVG

SVG is editable vector artwork. PNG is a high-resolution image. PDF uses landscape Letter pages, with a separate key when needed.

Downloads contain the complete boundary map, independent of zoom. Boundary data (GeoJSON) · Reuse with source credit.

Roads, terrain & aerial imagery

Explore Mercer County, New Jersey with a county boundary overlay. Choose a view to load the interactive map.

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Street names, terrain, or aerial photography with the county boundary in view.

Backgrounds load from OpenStreetMap or USGS only when selected. Imagery dates and detail vary by location.

Mercer County at a glance

Mercer County is one of 21 county-level areas in New Jersey. Its 224.5 square miles of land place it at position 16 among those areas by land size. Including 4.4 square miles of water, its mapped total area is approximately 228.9 square miles.

Full Census nameMercer County
StateNew Jersey
FIPS / GEOID34021
Boundary vintage2025
Outline source scale1:500,000

Counties along the boundary

These county-level areas share a line segment with Mercer County in the Census cartographic boundary dataset. Select one to continue exploring.

Looking for another Mercer County?

The short name “Mercer” also appears elsewhere. The state and FIPS code distinguish this area.

Using this map

Choose a blank outline for coloring or a labelled download for reference. SVG preserves editable boundary artwork, PNG works in slides, and PDF provides a ready-to-print landscape page. Use the full state map to compare surrounding counties.

Roads, topography, and aerial imagery are available in the interactive background viewer. Those backgrounds have their own dates and sources; the red boundary overlay follows the 2025 Census geography.

Sources and precision

U.S. Census Bureau, 2025 Cartographic Boundary Files. The county outline uses the 1:500,000 file; location maps and interactive overlays use 1:5,000,000. Areas come from ALAND and AWATER, converted to square miles and rounded to one decimal place. Neighbor links are calculated from shared boundary segments, not from point-only contacts. Generalized maps are for geographic reference, not parcel or legal boundary determination. Full methodology.