Maryland · FIPS 24031 · County seat: Rockville
Montgomery County, MD GIS & Parcel Viewer
Looking for lot lines or a parcel number in Montgomery County, MD? The quickest route is the Montgomery County ArcGIS parcel map, the county parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Montgomery County parcel map ↗
Opens experience.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Montgomery County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | experience.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Rockville |
| Population | 1,058,474 (2023 Census Bureau estimate) |
| Land area | 493 sq mi |
| FIPS code | 24031 |
Who runs this map
Montgomery County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. When we tested the link in October 2026 it opened with no login and no fee.
Searching for a parcel, step by step
- Press the button above; an ArcGIS Experience Builder app opens in a new tab. Accept any splash or disclaimer screen.
- Search by address or parcel ID, or pan to the area.
- Select a parcel to view the information the publisher makes available.
- Explore the app's panels for layers, legends or printing.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Montgomery County
Montgomery County had an estimated 1,058,474 residents in 2023, according to the Census Bureau. With about 493 square miles of land, that works out to roughly 2,147 people per square mile. That makes it the most populous of Maryland's 24 counties. Its county seat is Rockville.
Neighboring counties
Parcels close to the edge of Montgomery County can fall in the next county over. Neighboring counties:
- Frederick County
- Howard County
- Prince George's County
- Arlington County, VA
- District of Columbia, DC (state list)
- Fairfax County, VA
- Loudoun County, VA
Maps vs. surveys
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.