PlainZIP

Knoxville, MD

Single-footprint Census roll-up for Knoxville, MD: 1 USPS ZIP, population 4,921. Open the primary ZIP for household income, housing tenure, and commute from ACS 2023 5-Year Estimates.

U.S. Census Bureau, SimpleMaps US ZIP Code Database, delivery-area ZIP coverage

ACS city ledger plate

Sheet KNOXVILLE-MD · Knoxville, MD 1 ZIPs · 4,921 pop · #2904/25278 · Frederick County

INC-TOP · RANK-TOP · PHOTO-FINISH · BOOK-ONE · OWN-MID · POP-VILLAGE · SPREAD-UNK · HOME-HIGH

  • INC-TOP $111,528
  • RANK-TOP #2904/25278
  • PHOTO-FINISH ≈ Brunswick
  • BOOK-ONE 1 ZIP
  • OWN-MID 84% owners
  • POP-VILLAGE 4,921
  • SPREAD-UNK Single-ZIP book
  • HOME-HIGH $424,600

Nearest income peer: Brunswick, MD ( $2,146 income $)

Instrument codes from this city’s ACS household income, national rank, county-peer gap, ZIP book, owner tenure, population scale, intra-city income spread, and home-value band, not a moving recommendation.

Income neighbourhood around Knoxville

Lowest/highest poles plus county-sharing cities nearest Knoxville on average ZIP median household income. Full ladder: /cities.

median HH income

What this shows County-sharing peers only, not the full US city board. Open a near peer when the gap is small; open the poles when the mosaic is wide.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2026-08-25

National city placement

According to ACS 5-Year Estimates, Knoxville, MD sits among US cities with an upper-quartile household income, on a village-scale population base, across a single-ZIP footprint.

Top 11%
household income vs 25,278 US cities
4,921
city population (Census)
1
USPS ZIP codes covered
$111,528
avg ZIP median income

Income percentile ranks this city's average ZIP median household income against 25,278 US cities with ACS income on at least one ZIP. Scale and ZIP-spread words come from Census population and USPS ZIP coverage.

High-income footprint on only 1 ZIP: the city page and the ZIP page nearly coincide. Headline income $111,528 and home value $424,600 should be read as near-neighborhood numbers ; bachelor's attainment averages 43.7%.

Owner-occupancy sits in a mixed band (84.4%) - check the ZIP page's tenure split before treating Knoxville as a pure owner town.

Within Maryland, Sparrows Point is the closest lower-income city and Gaithersburg the closest higher-income city by average ZIP household income. Their 1 and 5 ZIP footprints are the immediate statewide comparison set for Knoxville.

Population concentration

Knoxville's single ZIP 21758 carries the town

Knoxville is published as a single USPS ZIP. Code 21758 is the entire residential footprint (4,921 ACS residents), so the city page and the ZIP page tell the same household story, open that ZIP for income, tenure, and commute detail.

Census ZBP business roll-up

Sparse ZBP book inside single-ZIP Knoxville

Citywide ZBP: 59 establishments, 402 employees , annual payroll $16,270k (~12 establishments per 1,000 residents) across 1 of 1 ZIPs. Peak business ZIP 21758 (59 units) ; leading NAICS Construction (16) · also Other services (except public administration) · Professional, scientific, and technical services .

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ZIP Codes in Knoxville, MD

These ZIP codes sit in Frederick County, which covers 28 ZIP codes in all; 1 of them fall in Knoxville. See the Frederick County roll-up →

Knoxville sits in the lower half of Frederick County on income: Frederick, Mount Airy and New Market report more, Thurmont and Emmitsburg report less. Monrovia marks the far end of that range at $183,571, 65% above Knoxville.

ZIP Code Population Median income Establishments Density
21758 4,921 $111,528 59 59
How we build city roll-ups · Guide: reading ZIP code data · BLS wages

Knoxville roll-ups here are for informational purposes only and do not constitute financial or relocation advice. ACS and Census ZBP figures are estimates; confirm the current table against Census before a money or move decision involving Knoxville, .