Buying a Home in St. Mary's County, Maryland: Complete Guide

Buyer's Guide · St. Mary's County, MD

I was born and raised in St. Mary's County, and I still think it's one of the best places in Maryland to put down roots. It's bordered by water on three sides, it's where Maryland began in 1634 at what's now Historic St. Mary's City, and it's home to NAS Patuxent River and the Navy's aviation test community. This guide covers what buyers need to know: the towns, the types of homes, what it costs, and the local details that trip up newcomers.

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St. Mary's County at a Glance

• Population: 116,692 (Census estimate, July 2025), up from 113,777 in the 2020 census.
• Median household income: $119,446 (Census, 2020 to 2024).
• Median value of an owner-occupied home: $407,600 (Census, 2020 to 2024). That's a long-run survey average, not today's sale prices.
• Homeownership rate: 73.2%, and median gross rent is $1,747 a month.
• Biggest employer: the Navy, with about 2,400 active-duty members, 9,800 civilians, and 5,700 contractors at NAS Patuxent River.
• Veterans: about 12,200 live in the county.

Towns and Areas

Where you buy in St. Mary's changes almost everything: price, commute, lot size, and lifestyle.

• Lexington Park: right outside the Pax River gates. Short drives to the gates and a lower Census median home value than the county.
• California: the main shopping and dining corridor along Route 235, close to Gate 1.
• Great Mills: established neighborhoods near Gate 2 on Great Mills Road.
• Leonardtown: the historic, walkable county seat on Breton Bay.
• Hollywood: rural lots and a quieter pace, near Sotterley and Greenwell State Park.
• Mechanicsville and Charlotte Hall: farm country and acreage in the north, a more central spot for commutes toward Waldorf.
• Piney Point, St. Inigoes and Ridge: Potomac and bay waterfront in the southern county.

Not sure which fits? Compare them in the best areas to live in St. Mary's County.

Types of Homes You'll Find

• Townhomes and starter homes near the base in Lexington Park, Great Mills, and California.
• Newer subdivisions around California and the outskirts of Leonardtown. Compare new construction vs. resale.
• Historic homes in and around Leonardtown. Read buying a historic home in Leonardtown.
• Rural properties and acreage in the northern county and around Hollywood.
• Waterfront homes on the Potomac, the Patuxent, the Chesapeake, and dozens of creeks.

What It Costs to Buy Here

Beyond the price, plan for closing costs of roughly 2% to 5%. St. Mary's charges a 1% county transfer tax (the first $30,000 is exempt for a home you'll live in) and $4.00 per $500 in recordation tax, plus the 0.5% state transfer tax. First-time Maryland buyers get the state rate cut to 0.25%, paid by the seller. Who pays which is negotiated in your contract. The full breakdown is in my first-time buyer guide.

Prices vary a lot by town and by water access, so a county-wide average won't tell you much about a specific home. Ask me for current numbers on the areas you're considering.

Property Taxes

For fiscal 2027, the county's real property tax rate is $0.8478 per $100 of assessed value, plus a smaller state rate. A home assessed at $350,000 owes about $2,967 a year in county tax. Maryland's Homestead Tax Credit limits how fast the taxable assessment on your main home can rise. See how St. Mary's property taxes work.

Commute and Pax River

NAS Patuxent River sits inside the county, in Lexington Park. All three gates come off Route 235: Gate 1 at Pegg Road is open 24/7, Gate 2 at Great Mills Road is open weekdays from 5:30 a.m. to 6:30 p.m., and Gate 3 at Hermanville Road is open only from 6 to 9 a.m. Commutes run from a few minutes in Lexington Park to about 20 to 30 minutes from Leonardtown and Mechanicsville. The county's average commute is just under 30 minutes, and it's roughly an hour to Waldorf and the DC suburbs. Military buyers should start with my PCS home buying guide.

Schools

St. Mary's County Public Schools serves the whole county with 18 elementary schools, 4 middle schools, and 3 high schools (Chopticon, Great Mills, and Leonardtown), plus a public charter school, a career and technology center, and a virtual academy. Assignments follow the exact address, not the town name. Here's how to check any home's schools.

Waterfront and the Critical Area

Land within 1,000 feet of tidal water or tidal wetlands is in Maryland's Critical Area, and the first 100 feet is a protected Buffer where clearing and building are generally off limits. That matters if you're planning a pier, deck, addition, or view clearing. Read waterfront homes in St. Mary's County: what buyers need to know before you write an offer on the water.

Well and Septic

Many homes here run on a private well and septic system. Add a well water test and septic inspection to your inspection period. If a septic system in the Critical Area ever needs replacing, Maryland requires a nitrogen-removing BAT system, which costs more than a standard one.

Lifestyle

Life here moves around the water. Boating, fishing, crabbing, and kayaking are everyday things, and Point Lookout State Park at the county's southern tip has camping, fishing, and Civil War history. Leonardtown's downtown is a designated Arts and Entertainment District. Historic St. Mary's City, Sotterley, and the Patuxent River Naval Air Museum give the county a sense of history you feel every day.

Is St. Mary's County a Good Place to Buy a Home?

For a lot of buyers, yes. You get water access, small-town character, and a stable job base built around the Navy and its civilian and contractor workforce. Each area trades something: some put you minutes from the gates, while others trade drive time for space or a walkable town. Living near the base? Read what the 2026 AICUZ noise study means for St. Mary's homes. Moving here for a civilian job? Start with my civilian relocation guide.

A Little History

Maryland's first colonial settlement was founded here in 1634, at what's now Historic St. Mary's City, and the county still carries that history in its place names, churches, and old homes. Sotterley, on the Patuxent in Hollywood, is a historic plantation site open to visitors, and Point Lookout State Park preserves Civil War history at the county's southern tip. That sense of place is part of what makes the county distinctive.

Getting Around

Route 235 (Three Notch Road) is the county's main north-south artery, running through California and Lexington Park past the Pax River gates. Route 5 runs through Charlotte Hall, Mechanicsville, and Leonardtown toward Point Lookout. Route 4 crosses the Patuxent on the Thomas Johnson Bridge into Calvert County. There's no commuter rail here, so most people drive.

What People Look For Here

• Short commutes to NAS Patuxent River and the contractor offices around it.
• Room to grow, from townhomes to single-family homes and land.
• Water, with waterfront and water-access homes on the Potomac, the Patuxent and the bay.
• Rental property near the base.

Everyone weighs these differently, which is why I ask about your commute, timeline, and plans before I send a single listing.

The Buying Process Here

The steps are the same as anywhere in Maryland: get preapproved, choose your agent, tour, offer, inspect, appraise, and settle. What's different here is the local checklist: gate hours, well and septic, the Critical Area, flood zones, school assignments, and noise zones near the base. My complete first-time buyer guide walks through every step, and I'll make sure the local checks happen on every home we look at.

Sources: U.S. Census QuickFacts: St. Mary's County · Military OneSource: NAS Patuxent River · SMCPS: About Us · Maryland DLS 2026 county tax rates · Gordon Feinblatt on Maryland transfer taxes · Maryland DNR Critical Area FAQ · NAS Patuxent River base access. Checked October 2026; rules and rates change, so confirm anything that affects your decision.

Nearby Areas

• California, MD
• Leonardtown, MD
• Lexington Park, MD
• Mechanicsville, MD
• Hollywood, MD
• Great Mills, MD
• Charlotte Hall, MD
• Piney Point, St. Inigoes & Ridge, MD