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Port Costa California Map

Explore Port Costa, California, with this interactive street and satellite map.

This page also offers TOPO MAPS — the official USGS topographic sheets — plus USGS aerial imagery, a labelled USNG grid overlay, a distance and bearing tool, and a GPS grid-reference readout. See How to Use This Map below.

Interactive Map of Port Costa, California

How to Use This Port Costa, California Map

This interactive map shows the street layout and satellite imagery for Port Costa, California. Use the Map and Satellite buttons above to switch between street map and aerial imagery views. Use the + and − buttons to zoom in or out, or scroll your mouse wheel while holding the Control key to zoom. On a touchscreen, use a two-finger pinch gesture. Drag the map to pan to any area of California or beyond.

Click ⛶ Fullscreen to expand the map to fill your screen. To return to the normal page view, press the Escape key, click the ✕ Exit Fullscreen button that appears above the map, or on a mobile device tap the back button (Android) or the close icon (iOS).

TOPO MAPS — NEW. Click the green 🔍 Search Maps button below the map to open a second map with a Base map row offering three choices. OSM is the standard OpenStreetMap street map. Topo shows the official USGS topographic maps from The National Map — contours, hydrography, land cover and shaded relief, the same mapping used for hiking, hunting and back-country navigation in the Adirondacks, the Catskills and the Finger Lakes. Imagery shows USGS aerial photography, mostly 1-metre NAIP. The search box finds any US town, county or landmark by name, so you are not limited to Port Costa.

Reading the map like a paper quad. Click Grid to overlay the U.S. National Grid (USNG), labelled along the edges exactly as a printed topographic sheet is — at normal zoom the squares are one kilometre across, so you can read a six-figure grid reference by eye and judge distance directly off the map. Click Measure, then tap two points, to get the distance between them together with the grid bearing in degrees and mils, the true bearing, and the magnetic bearing to set on a compass.

Click 📍 My position to take a single GPS reading from your device. It marks where you are and reports your position as a USNG grid reference as well as plain latitude and longitude — USNG being the format FEMA and US search and rescue teams work from — with a Copy position button so you can paste it straight into a text message. It takes one reading and stops, rather than tracking continuously, to conserve your battery. Note that map tiles need cell coverage, but a GPS reading does not — your coordinates stay correct even where the map itself cannot load.

City	Port Costa
State	California (CA)
County	Contra Costa County
Country	United States of America
Timezone	Pacific Time (America/Los_Angeles)

Latitude	38.04631
Longitude	-122.1833
Population	190
Density	464.3 /km²
Incorporated	N/A
ZIP Code	94569
Area Code	510
County Seat	Martinez
School District	John Swett Unified School District

🌦 Goto Port Costa Weather Page: Port Costa, California — Weather Warnings, Forecast, Radar, Satellite & Current Conditions

About Port Costa, California

Port Costa is a locality in Contra Costa County, California, United States. It is a small community with a population of 190. The population density is 464.3 people per km². Port Costa is located at 38.0463°N, 122.1833°W. It observes the Pacific Time (America/Los_Angeles) timezone. ZIP code: 94569.

Port Costa defines the edge where the land yields to the heavy, salt-thick air of the Pacific Ocean. It lies 1.4 miles west of Benicia, CA (from Benicia, CA: bearing 261°T), and is situated 9.5 miles west-northwest of Concord. This terminal point sits within the bowl of Big Bull Valley, where the terrain rises in dry, tawny folds that catch the long, slanted light of the afternoon. To the west, the horizon holds the faint, jagged silhouette of the Coast Ranges, standing as a distant boundary against the sky. The immediate surroundings are defined by the Carquinez Strait Regional Shoreline, a landscape of raw earth and scrub that feels weathered by the persistent, shifting tides of the Pacific Ocean. Even the nearby Pacific Ocean—a small, seasonal catchment—reflects the muted, gray-blue tones of a sky that rarely stays clear for long.

Port Costa bears the quiet weight of a maritime history that once relied on the deep-water access provided by the wide, moving channel. Where wheat elevators and bustling rail yards once formed the economic pulse of the shoreline, now only the skeletal remains of industry linger, repurposed into the quiet, eclectic life of the modern neighborhood. The pace here moves with the slow, deliberate rhythm of the water, far removed from the frantic pace of the nearby inland centers. Travelers might find their way toward the paths of the Carquinez Strait Regional Shoreline, or simply watch the fog drift in from the Pacific Ocean, obscuring the distant cranes of Mare Island across the water. Life in Port Costa maintains a stubborn, singular character, shaped by the memory of ships and the slow encroachment of the wild hills that rise toward the horizon.

Nearby Outdoor Places

Port Costa Warehouse (Monument) — 0.0 mi, 340° N
The Burlington Hotel (Monument) — 0.0 mi, 312° NW
Carquinez Strait Regional Shoreline (Local Park) — 0.0 mi, 322° NW
City of Benicia Fishing Pier (Attraction) — 1.0 mi, 098° E
Benicia State Recreation Area (State Recreation Area) — 1.1 mi, 330° NW
Turner / Robertson Shipyard (Monument) — 1.1 mi, 011° N
Southern Pacific Ferry Terminal (Historic Ruins) — 1.2 mi, 297° NW
Benicia Plein Air Gallery (Gallery) — 1.2 mi, 088° E
Happy Life Pottery (Gallery) — 1.4 mi, 081° E
Benicia Capitol (Museum) — 1.4 mi, 079° E
Benicia Bench (Public Artwork) — 1.5 mi, 096° E
Crockett Hills Regional Park (Local Park) — 1.5 mi, 244° SW
Bandstand (Attraction) — 1.6 mi, 071° E
Braito Open Space (Local Recreation) — 1.8 mi, 356° N
Glen Cove Nature Area (Local Conservation Area) — 1.9 mi, 320° NW
Tourtelot Open Space (Local Recreation) — 2.4 mi, 019° N
1958 Carquinez Bridge (Attraction) — 2.5 mi, 293° NW
2003 Alfred Zampa Memorial Suspension Bridge (Attraction) — 2.6 mi, 294° NW
Bridges & San Francisco Bay Viewpoint (Viewpoint) — 2.8 mi, 299° NW
Main Street Arts Gallery (Gallery) — 3.2 mi, 129° SE
Martinez Museum (Museum) — 3.2 mi, 125° SE
Grizzly Island Wildlife Area (State Conservation Area) — 3.3 mi, 071° E
Mullen Theater (Theatre) — 5.1 mi, 321° NW
Point Edith Wildlife Area (State Conservation Area) — 5.3 mi, 089° E
Vallejo Naval and Historical Museum (Museum) — 5.6 mi, 315° NW
Mare Island Art Glass (Arts Centre) — 6.3 mi, 309° NW
San Pablo Bay National Wildlife Refuge (National Wildlife Refuge) — 7.4 mi, 313° NW · 43k acres
Mount Diablo State Park (State Park) — 14.9 mi, 130° SE
Golden Gate National Recreation Area (National Recreation Area) — 19.8 mi, 220° SW · 113k acres
Berryessa Snow Mountain National Monument (National Monument) — 28.3 mi, 005° N · 598k acres

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