Dallas City: Geode Digging in Hancock County, Illinois

Updated June 2026

Dallas City is a mapped rockhounding spot in Hancock County, Illinois. Reported finds include geode, calcite, malachite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Hancock County
State: Illinois
Nearest road: Oak Street
Postcode: 62330
Coordinates: 40.63081, -91.16643

Geology at Dallas City

This spot sits on Warsaw Formation and Salem Limestone, mapped as limestone that formed roughly 345 to 330 million years ago. Limestone country like this is classic geode ground: cavities in the carbonate rock can line themselves with quartz or calcite crystals.

Mapped unit: Warsaw Formation and Salem Limestone
Age: 345–330 Ma (Mississippian)
Rock types: limestone
Elevation: 610 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Dallas City

Best months: March to November. Typical highs run 85°F in midsummer and 33°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, FT MADISON station (9 mi away).

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Dallas City

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Dallas City.

Across the state line from Dallas City

Dallas City is close enough to the Illinois border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Dallas City FAQ

Where is Dallas City?+

Dallas City is in Hancock County, Illinois, at 40.63081, -91.16643. Nearest road: Oak Street.

What rocks and minerals can you find at Dallas City?+

Dallas City is reported to produce Geode, Calcite, Malachite.

Is collecting allowed at Dallas City?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Dallas City?+

Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.

When is the best time to visit Dallas City?+

The most comfortable months at Dallas City are March to November.

How do I get to Dallas City?+

Open the directions link to navigate to 40.63081, -91.16643 in Google Maps. The nearest road is Oak Street.

More rockhounding in Illinois

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Open Dallas City on the map

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