421 121ST St GULF, Marathon, FL 33050

Single family property built in 1963 with 1,803 sq ft of living area on a 0.17-acre lot in Marathon, Monroe County. Facts below come from the county property appraiser's public record.

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County just value (tax roll) — not a market value

$1,385,461

County assessed value (tax roll)

$1,385,461

Living area

1,803 sq ft

Lot size

0.17 acres (7,585 sq ft)

Year built

1963

Land use

Single family

FEMA flood zone

Not on file yet

County

Monroe County, FL

Parcel ID

fl-54-0566 33 00357510000000

At a glance

Who owns 421 121ST St GULF?: Monroe County property records list COLON MARK as the owner of record.
What is the county just value of 421 121ST St GULF?: $1,385,461 on the Monroe County tax roll (as of January 1). Just value is the property appraiser's figure for property taxes — not a market value.
What is the parcel ID?: fl-54-0566 33 00357510000000 (Monroe County).

Current owner

COLON MARK

Owner contact info

Phones, emails and mailing addresses from public Florida records are available to members.

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Nearby properties

423 121ST St GULF, Marathon $1.4M · built 1961
419 121ST St GULF, Marathon $2.3M · built 1999
425 121ST St GULF, Marathon $1.2M · built 1961
318 120TH St GULF, Marathon $636K · built 1986
325 122ND St GULF, Marathon $773K · built 1968
435 121ST St GULF, Marathon $1.4M · built 1981
12020 OVERSEAS Hwy 8, Marathon $1.5M · built 1960
310 120TH St GULF, Marathon $546K · built 1976

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Source: Florida Department of Revenue parcel roll; data refreshed Jun 25, 2026. Values are county tax-roll figures, not appraisals. How to read these values · Data sources