Grand Lake St Marys State Park
- Status
- Status not posted
- Entrance fee
- Not posted
- Day-use reservations
- None mentioned
- Dogs
- Not stated — check with park
- Camping
- YesAlso cabins, glamping or camper cabins
- Official site
- parks.ohiodnr.gov
Official page last checked Oct 29, 2026. How we keep this current
Overview
Grand Lake St Marys State Park is a 2,665-acre park in Mercer County, about 4 miles southeast of Celina.
Water access includes a swimming beach, a swimming pool, a boat ramp, and a fishing pier. Camping is available: 5 camping areas, including RV sites, tent sites, primitive or hike-in sites, group camping, and showers. There are also cabins and camper cabins or similar shelters for rent.
Reservations
- Day use
- No day-use reservation requirement mentioned
- Booking system
- Reserve Ohio (reserveohio.com/OhioCampWeb)
We link to the official booking system rather than showing live availability, which changes minute to minute.
Camping
| Campground or site type | Sites | Hookups / features | Price |
|---|---|---|---|
| Camp Office 1 mapped point(s) in ODNR GIS | — | — | |
| Campground 1 mapped point(s) in ODNR GIS | — | — | |
| Primitive Camp* 1 mapped point(s) in ODNR GIS | — | — | |
| Group Camp 1 mapped point(s) in ODNR GIS | — | — | |
| Camper Cabin 2 mapped point(s) in ODNR GIS | — | — |
From the official park page, checked Oct 29, 2026. Site counts and prices can change; confirm when booking.
Things to do
Camping
Amenities
Facilities
- Restrooms
- Showers
- Drinking water
- Picnic shelters
- Playground
- Visitor center
- Nature center or museum
- Park or camp store
- Parking
- Amphitheater
- Group facilities
- Dog park or off-leash area
Water
- Swimming beach
- Swimming pool
- Splash pad
- Boat ramp
- Marina or boat slips
- Fishing pier
Camping
- RV dump station
- Tent camping
- RV camping
- Primitive or backcountry camping
- Group camping
Lodging
- Cabins
- Glamping or camper cabins
Recreation
- Golf course
- Disc golf
- Bike rentals
✓ listed by the park · ✕ the park says it is not available. Anything not shown here isn’t mentioned by the official source — that means unknown, not unavailable.
Getting there
- Nearest town
- Celina — about 4 mi southeast (straight line)
- Coordinates
- 40.5264, -84.5008
Nearby state parks
Sources and freshness
- Ohio State Parks — park page — last checked Oct 29, 2026; page says updated Sep 17, 2020
- ODNR ArcGIS REST: ODNR_ODNR_Lands_Public_nolakes / Parks Facilities (point per state park, DIV_CODE 730)
- Wikidata
- USGS PAD-US 4.1 (boundary and acreage)
- Photo: Grand Lake St. Marys Lighthouse.jpg — Public domain (released by the author), Nyttend
“Last checked” is when our system last read the official source. No change has been detected since this page was first published. Hours, fees and rules can change without notice — confirm with the park before you go. Methodology