LatestCoverageAll 50 states, D.C. and five territories now on the ledger|NewPuerto Rico's 78 municipios ledgered, municipio by municipio|FeatureAssessment appeal workspace — build a filing package from your own evidence|FeatureLiving reports — versioned, re-runnable, exportable|DevelopersMetered REST gateway · issued keys · signed webhooks|Live market readings · refreshed on loadAlbuquerque · NMMedian List$360K+2.5%|Austin · TXMedian List$290K-3.5%|Baltimore · MDMedian List$265K+1.1%|Bernalillo County · NMMedian List$364K+2.7%|Bexar County · TXMedian List$303K+3.7%|Boston · MAMedian List$859K+3.4%|Charlotte · NCMedian List$402K+1.2%|Chicago · ILMedian List$426K+9.3%|Clark County · NVMedian List$447K+0.1%|Columbus · OHMedian List$300K+0.7%|Cook County · ILMedian List$348K+5.1%|Dallas · TXMedian List$449K-0.1%|Davidson County · TNMedian List$465K-1.1%|Denver · COMedian List$618K+5.0%|Detroit · MIMedian List$321K-2.7%|Duval County · FLMedian List$297K-2.3%|El Paso · TXMedian List$260K+3.7%|Fort Worth · TXMedian List$330K-1.5%|Franklin County · OHMedian List$320K+3.2%|Fresno · CAMedian List$375K+2.1%|Harris County · TXMedian List$327K+0.6%|Houston · TXMedian List$340K+0.6%|Indianapolis · INMedian List$250K+2.7%|Jackson County · MOMedian List$275K+7.0%|Jacksonville · FLMedian List$312K-1.4%|Jefferson County · KYMedian List$248K-4.3%|Kansas City · MOMedian List$310K+3.1%|King County · WAMedian List$850K-4.0%|Las Vegas · NVMedian List$440K-1.1%|Los Angeles · CAMedian List$950K-0.5%|Louisville · KYMedian List$280K+1.8%|Maricopa County · AZMedian List$458K-0.4%|Marion County · INMedian List$259K+3.7%|Mecklenburg County · NCMedian List$407K-5.3%|Memphis · TNMedian List$209K+4.7%|Mesa · AZMedian List$490K-0.9%|Milwaukee · WIMedian List$243K+5.7%|Multnomah County · ORMedian List$518K-1.2%|Nashville · TNMedian List$480K+1.0%|New York · NYMedian List$899K+0.5%|Oklahoma City · OKMedian List$275K-0.4%|Oklahoma County · OKMedian List$259K-0.7%|Philadelphia · PAMedian List$249K+0.3%|Phoenix · AZMedian List$480K0.0%|Pima County · AZMedian List$373K+0.9%|Portland · ORMedian List$640K-6.0%|Sacramento · CAMedian List$510K+4.0%|San Antonio · TXMedian List$236K-1.2%|San Diego · CAMedian List$994K+4.2%|San Francisco · CAMedian List$1.6M+14.9%|San Jose · CAMedian List$1.3M-11.9%|Santa Clara County · CAMedian List$1.3M+0.1%|Seattle · WAMedian List$874K-2.8%|Shelby County · TNMedian List$259K-2.4%|Suffolk County · MAMedian List$857K+7.3%|Tarrant County · TXMedian List$385K-1.2%|Travis County · TXMedian List$497K-5.3%|Tucson · AZMedian List$324K-0.9%|Wayne County · MIMedian List$160K0.0%|LatestCoverageAll 50 states, D.C. and five territories now on the ledger|NewPuerto Rico's 78 municipios ledgered, municipio by municipio|FeatureAssessment appeal workspace — build a filing package from your own evidence|FeatureLiving reports — versioned, re-runnable, exportable|DevelopersMetered REST gateway · issued keys · signed webhooks|Live market readings · refreshed on loadAlbuquerque · NMMedian List$360K+2.5%|Austin · TXMedian List$290K-3.5%|Baltimore · MDMedian List$265K+1.1%|Bernalillo County · NMMedian List$364K+2.7%|Bexar County · TXMedian List$303K+3.7%|Boston · MAMedian List$859K+3.4%|Charlotte · NCMedian List$402K+1.2%|Chicago · ILMedian List$426K+9.3%|Clark County · NVMedian List$447K+0.1%|Columbus · OHMedian List$300K+0.7%|Cook County · ILMedian List$348K+5.1%|Dallas · TXMedian List$449K-0.1%|Davidson County · TNMedian List$465K-1.1%|Denver · COMedian List$618K+5.0%|Detroit · MIMedian List$321K-2.7%|Duval County · FLMedian List$297K-2.3%|El Paso · TXMedian List$260K+3.7%|Fort Worth · TXMedian List$330K-1.5%|Franklin County · OHMedian List$320K+3.2%|Fresno · CAMedian List$375K+2.1%|Harris County · TXMedian List$327K+0.6%|Houston · TXMedian List$340K+0.6%|Indianapolis · INMedian List$250K+2.7%|Jackson County · MOMedian List$275K+7.0%|Jacksonville · FLMedian List$312K-1.4%|Jefferson County · KYMedian List$248K-4.3%|Kansas City · MOMedian List$310K+3.1%|King County · WAMedian List$850K-4.0%|Las Vegas · NVMedian List$440K-1.1%|Los Angeles · CAMedian List$950K-0.5%|Louisville · KYMedian List$280K+1.8%|Maricopa County · AZMedian List$458K-0.4%|Marion County · INMedian List$259K+3.7%|Mecklenburg County · NCMedian List$407K-5.3%|Memphis · TNMedian List$209K+4.7%|Mesa · AZMedian List$490K-0.9%|Milwaukee · WIMedian List$243K+5.7%|Multnomah County · ORMedian List$518K-1.2%|Nashville · TNMedian List$480K+1.0%|New York · NYMedian List$899K+0.5%|Oklahoma City · OKMedian List$275K-0.4%|Oklahoma County · OKMedian List$259K-0.7%|Philadelphia · PAMedian List$249K+0.3%|Phoenix · AZMedian List$480K0.0%|Pima County · AZMedian List$373K+0.9%|Portland · ORMedian List$640K-6.0%|Sacramento · CAMedian List$510K+4.0%|San Antonio · TXMedian List$236K-1.2%|San Diego · CAMedian List$994K+4.2%|San Francisco · CAMedian List$1.6M+14.9%|San Jose · CAMedian List$1.3M-11.9%|Santa Clara County · CAMedian List$1.3M+0.1%|Seattle · WAMedian List$874K-2.8%|Shelby County · TNMedian List$259K-2.4%|Suffolk County · MAMedian List$857K+7.3%|Tarrant County · TXMedian List$385K-1.2%|Travis County · TXMedian List$497K-5.3%|Tucson · AZMedian List$324K-0.9%|Wayne County · MIMedian List$160K0.0%|
Property-class scope

The story of this market

The typical home in ZIP 21757 sells for about $414,300, or $165 per square foot.

Prices are up +2.5% from a year ago, so sellers still have some momentum. Homes take about 45 days to sell. HUD's fair market rent for a two-bedroom is $1,408 a month.

ZIP market report · consumer edition · quarterly refresh
Track this ZIP

ZIP 21757 — Keymar

Carroll County →refreshed Sep 29, 20262 cycles retainednext refresh Oct 29, 2026
Market mood · neutral

The housing market in 21757 is characterized by low inventory and stable, moderate price growth consistent with rural Maryland trends. Demand remains steady among local buyers, though the limited number of closed sales reflects the tight supply of available homes. Most figures are sourced from recent ACS and market portal data; some specific metrics like price-cut percentages are estimated based on regional trends.

Who this ZIP fits

This ZIP is best suited for families and individuals seeking a quiet, rural lifestyle who are comfortable with a longer commute to major employment centers.

Parent geography
Keymar · no city intel reportCarroll County →Maryland state →
Aerial view · ZIP boundaries2020 Census ZCTA boundary over current aerial imagery
Leaflet Imagery © Esri, Maxar, Earthstar Geographics
Land area · 91.1 km²Water area · 0.2 km²U.S. Census Bureau TIGERweb — 2020 Census ZCTA5 boundary
Median sale price
$414,300
+2.5% year over year
Corroborated · 1 anchor · 0% off nearest
Days on market
45 days
Active listings
12
Listings with price cuts
15%
share of active listings
Sale-to-list ratio
98.5%
of asking price
ZIP Market ScoreZIP-SCORE-1.3 · 4/4 sections graded
77
Composite · average of graded sections
Computed only from this report's published readings — sections without data are excluded, never estimated.
63
Growth/100

Median prices moved up 2.5% year over year.

74
Liquidity/100

Homes spend a median of 45 days on market with 3.2 months of supply — a fast-moving market.

73
Momentum/100

15% of listings have cut prices · homes sell at 98.5% of asking — demand is running ahead of supply.

96
Safety & stability/100

no recorded foreclosure-ledger notices (0.0 per 10,000 residents) · unemployment 3.2% · poverty 1.7% — a stable, low-distress profile.

Median price · ten-year history

Researched annual trajectory for this ZIP, from published historical series

2015201620172018201920202021202220232024202520272029$260,000$325,000$390,000$455,000$520,000

Solid: researched ten-year history · dotted: 1 / 3 / 5-year projection extended from the historical 4.2%/yr trend — a deterministic estimate, not a published forecast or guarantee.

Property tax · ten-year history

Median annual property tax paid on this ZIP's residential parcels

2015201620172018201920202021202220232024202520272029$2,600$3,250$3,900$4,550$5,200

Solid: researched ten-year history · dotted: 1 / 3 / 5-year projection extended from the historical 3.9%/yr trend — a deterministic estimate, not a published forecast or guarantee.

Census trends · population flowsACS 2019-2023 5-year estimates
Population change
+0.5%

versus the prior ACS vintage

Population base
2,671

ZCTA 21757, Carroll County MD

Area context
Schools & education

The area is served by the Carroll County Public Schools system, which generally maintains a positive reputation for academic performance within the region.

Environmental & hazard

The area is primarily rural with standard regional risks for wind and storm events; flood risk is localized to specific low-lying areas near streams.

Growth & development

Economic momentum is driven by proximity to the Baltimore-Washington corridor, though the immediate ZIP remains largely rural and agricultural.

Taxation

Composed from the ARED governance burden registry — tier-native tax structure (state + county + city + special districts), never averaged. State (Maryland) — Maryland Real Property Assessment and Taxation: Property is assessed at its phased-in use value. The tax is calculated by multiplying the assessed value by the applicable state and local tax rates.

Transportation & commute

Residents typically commute by car to employment hubs in Westminster, Frederick, or the Baltimore metro area, with limited access to public transit.

Recreation & amenities

The area features rural landscapes, local parks, and proximity to regional trails and outdoor recreation sites in northern Maryland.

Rental market

The rental market is limited in depth due to the predominantly single-family, owner-occupied nature of the housing stock.

Economy & employers

The local economy is anchored by agriculture, small businesses, and service-sector employment, with many residents commuting to larger nearby cities.

Transportation & infrastructure

Transportation is heavily reliant on personal vehicles, with access to major state routes connecting to the broader Maryland highway network.

Development pipeline

Development is primarily focused on low-density residential growth and agricultural preservation.

County appraisal district

The Carroll County assessment office manages property valuations based on a triennial assessment cycle.

Special districts

Parcels are subject to Carroll County Public Schools district taxes and standard municipal utility service districts.

Insurance & hazard market

Property insurance premiums are consistent with rural Maryland standards, reflecting moderate risk profiles for weather-related damage.

Discovery profileACS 2019-2023 5-year estimates
Census profile · ZCTA 21757, Carroll County MD
Population
2,671
Median age
37.8 yrs
Owner-occupancy
93.2%
Median home value
$414,300
Median gross rent
$1,450
Median household income
$100,500
Median year built
1962
Vacancy rate
6.2%
Renter share
6.8%
Owner cost burden
22.5%
Renter cost burden
31.2%
Population change
+0.5%
Work-from-home share
18.5%
Mean commute
38.5 min
Bachelor's or higher
32.4%
Unemployment
3.2%
Poverty rate
1.7%
Avg household size
2.6
White
94.5%
Hispanic
2.1%
Black
1.2%
Other
2.2%

Data retrieved from Census Bureau ZCTA-level tables.

Public schools with an address here · 2

Public schools whose reported address is in this area (NCES). Not attendance boundaries — schools that serve residents may sit outside it. Check the district's address locator for assignment.

Keymar ElementaryElementary6/10Carroll County Public SchoolsServes the local elementary population.
Francis Scott Key HighHigh7/10Carroll County Public SchoolsPrimary high school for the area.
School districts
Carroll County Public SchoolsB+Large district serving the county with consistent performance metrics.
Utilities & services
ElectricBGE / Potomac EdisonDeregulated market allows choice of retail supplier.
InternetXfinity / ViasatAvailability varies by specific location within the ZIP.
Water/SewerPrivate/Well/SepticMost properties rely on private well and septic systems.
Major employers & industries
Carroll County GovernmentPublic AdministrationMajor regional employer.
Local Agricultural OperationsAgricultureSignificant land use and economic contributor.
Major amenities · ZIP 21757
Theme, amusement & water parks
11 · 20 mi
Entertainment venues, stadiums & amphitheaters
16 · 20 mi
Parks, trails & nature
17 · 13 mi
Lakes, marinas & beaches
1 · 20 mi
Shopping & dining districts
9 · 13 mi
Airports
1 · 31 mi

Theme parks, venues, golf, airports, museums, water and shopping across the area from Google Maps, ranked by popularity within the radius shown.

Amenities & attractions1 retained amenity
Inside this ZIP
Keymar Park
Park

Local community green space serving the immediate area.

Sources · 5 cited

Key-figure check: median price corroborated by the published ten-year series (2024) (within 12.5%).