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State markets/Maryland/Montgomery County/ZIP area 20817

ZIP AREA · ZCTA 20817 · CENSUS 2020

ZIP area 20817

The 15 census tracts that make up ZIP Code Tabulation Area 20817 in Montgomery County. Each tract opens its own lender ranking and its full HMDA record list.

Census tracts

15

9 counted under this ZIP

Counties

1

wholly inside one county

Population

36,051

of the tracts this ZIP owns

Owner-occupied units

10,390

11,263 1-4 family homes

Census tracts in ZIP area 20817

Every tract this ZIP area touches — sort, filter by population or overlap, export, or open a row for the tract's card. The RECORDS column opens that tract's HMDA records in the loan explorer, which is where a ZIP-scoped question becomes an exact one.

15 OF 15 TRACTSEVERY TRACT THIS ZIP AREA TOUCHES — NO ROWS WITHHELD
RECORDS
Montgomery County20852This tract overlaps 20817 but sits mostly inside 20852, so it is counted there and not here.22.0%7,090UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.100.0%3,742UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.100.0%2,786UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.99.1%4,247UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.85.4%5,255UpperOPEN →
Montgomery County20815This tract overlaps 20817 but sits mostly inside 20815, so it is counted there and not here.16.5%4,097UpperOPEN →
Montgomery County20816This tract overlaps 20817 but sits mostly inside 20816, so it is counted there and not here.10.1%6,489UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.99.6%4,501UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.93.7%4,402UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.100.0%4,616UpperOPEN →
Montgomery County20854This tract overlaps 20817 but sits mostly inside 20854, so it is counted there and not here.9.0%4,664UpperOPEN →
Montgomery County20854This tract overlaps 20817 but sits mostly inside 20854, so it is counted there and not here.13.2%5,301UpperOPEN →
Montgomery County20854This tract overlaps 20817 but sits mostly inside 20854, so it is counted there and not here.43.4%5,569UpperOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.100.0%3,522MiddleOPEN →
Montgomery County20817Most of this tract's land is inside 20817, so its population and housing count toward 20817.100.0%2,980UpperOPEN →

What a ZIP area is, and what it is not

A ZCTA — ZIP Code Tabulation Area — is the U.S. Census Bureau's area approximation of a USPS ZIP code, not the ZIP code itself. HMDA reports no postal geography at all, so these rows are census tracts grouped by the Census 2020 tract-to-ZCTA relationship file: each tract is counted once, in the single ZCTA covering the most of its land.

We publish no ZIP-level lending figure on this page, and the omission is deliberate. Summing tract originations into a ZIP would be an approximation dressed as a measurement: the boundary is areal, a tract that straddles two ZIPs has to be given to one of them, and HMDA never said the loan was in a ZIP in the first place. The lending figures live one level down, on each tract’s own page, where they are exactly what the lender reported.

Also checked and not used: FHA endorsement records carry a property ZIP, but they cover one loan programme rather than the market, and matching them to a county by name collides in Virginia, where “Richmond” is both a county and an independent city. We do not publish a figure we cannot attribute with certainty.

Go deeper

Step back up to the Montgomery County market profile, which lists every ZIP area in the county, or the Maryland state profile.

Sources: U.S. Census Bureau 2020 ZCTA-to-census-tract relationship file (zcta_tract_rel, 168,212 overlaps across 33,791 ZCTAs and 85,143 tracts, loaded 2026-08-02); FFIEC census-tract file; HMDA tract attributes. Housing figures are summed over the tracts this ZIP area is dominant for, so they match the county page’s row for the same ZIP exactly. Figures are as loaded — see data attribution.