William St, Key West, FL Property Records

Monroe County property records for 89 addresses on William St, Key West, FL · Last verified August 2026

William St Highlights

Properties 133
Median Sale Price $1,250,000
Deeds and Mortgages on File 153
Median Price per Sqft $1,054
Owner Occupied 26%
Median Annual Tax Bill $7,356
Median Year Built 1933
Median Ownership Tenure 12 years

Properties on William St

Owner names and prior sale amounts shown locked below are available instantly with a free trial.

200 William St

31,870 sqft · Built 2014 · 1.88 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
—Nov 2018 1 Name on Record AssessorUpdated Dec 2025

201 William St

2 ba · 46,276 sqft · 0.569 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
1 Name on Record AssessorUpdated Dec 2025

202 William St

3 ba · 2,196 sqft · 0.138 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$24,2652024 1 Name on Record AssessorUpdated Dec 2025

309 William St

2 bd · 1 ba · 860 sqft · 0.06 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,125,000Feb 2025 $5,7942024 1 Name on Record Assessor + 1 DocumentUpdated Dec 2025

310 William St

2 bd · 3 ba · 1,802 sqft · 0.092 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$340,000Jun 1988 $16,8032024 1 Name on Record AssessorUpdated Dec 2025

311 William St

3 bd · 2 ba · 1,132 sqft · 0.126 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$100Dec 2018 $19,0932024 Amount on Record Jan 2014 1 Name on Record Assessor + 1 DocumentUpdated Apr 2026

312 William St

2 bd · 2 ba · 1,376 sqft · 0.051 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,650,000Oct 2025 $9,2412024 Amount on Record Nov 2011 1 Name on Record Assessor + 5 DocumentsUpdated Jul 2026

313 William St

4 bd · 2.5 ba · 2,982 sqft · 0.219 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$3,750,000Feb 2021 $34,7382025 Amount on Record Jun 2008 1 Name on Record Assessor + 1 DocumentUpdated May 2026

314 William St

1 bd · 1 ba · 630 sqft · 0.029 acres

Last Sale Tax Bill Prior Sale Owner Records
$10,000Feb 1972 $5,9612024 1 Name on Record Assessor + 1 DocumentUpdated Jul 2026

315 William St

5 bd · 4 ba · 2,500 sqft · 0.072 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,700,000Aug 2022 $14,1652024 Amount on Record Jun 2014 1 Name on Record Assessor + 2 DocumentsUpdated Apr 2026

316 William St

3 bd · 2 ba · 1,436 sqft · 0.088 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,200,000Feb 2021 $13,0962024 Amount on Record Dec 2016 2 Names on Record Assessor + 1 DocumentUpdated Dec 2025

317 William St

3 bd · 3 ba · 1,970 sqft · 0.042 acres

Last Sale Tax Bill Prior Sale Owner Records
$770,000Sep 2019 $7,2442024 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Dec 2025

320 William St

4 units · Built 1938 · 390 sq ft

Last Sale Median Tax Bill Median Sale    
$490,000Apr 2022 $4,1562024 —4 units    

324 William St

3 bd · 2.5 ba · 3,276 sqft · 0.101 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,925,000Jun 2008 $19,7572025 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

326 William St

2 bd · 3 ba · 1,622 sqft · 0.033 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,400,000Jul 2021 $12,1562025 Amount on Record Nov 2014 1 Name on Record Assessor + 1 DocumentUpdated May 2026

327 William St

3 bd · 3 ba · 1,676 sqft · 0.085 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$2,190,000Feb 2023 $15,1942024 Amount on Record Dec 2020 1 Name on Record Assessor + 2 DocumentsUpdated Jul 2026

328 William St

3 bd · 3 ba · 1,427 sqft · 0.083 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$922,000Jun 2004 $4,7162024 Amount on Record Jul 1986 1 Name on Record Owner Occupied Assessor + 2 DocumentsUpdated Apr 2026

329 William St

5 ba · 3,014 sqft · 0.123 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$3,600,000Jan 2025 $18,3232024 Amount on Record Apr 2016 2 Names on Record Assessor + 2 DocumentsUpdated Apr 2026

405 William St

4 bd · 3 ba · 2,054 sqft · 0.101 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$2,700,000May 2022 $17,9172024 Amount on Record Feb 2012 2 Names on Record Assessor + 2 DocumentsUpdated Dec 2025

408 William St

4 bd · 3 ba · 1,575 sqft · 0.061 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$975,000Dec 2008 $13,1132024 1 Name on Record AssessorUpdated Dec 2025

409 William St

3 bd · 3.5 ba · 3,226 sqft · 0.095 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$3,200,000Jul 2021 $27,2782024 Amount on Record Jun 2016 1 Name on Record Assessor + 2 DocumentsUpdated Apr 2026

411 William St

26 units · Built 1983 · 142 sq ft

Last Sale Median Tax Bill Median Sale    
$650,000Mar 2023 $3,5532024 $8,840,00026 units    

412 William St

3 bd · 2 ba · 801 sqft · 0.063 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$10,0202024 1 Name on Record AssessorUpdated Dec 2025

414 William St

3 bd · 2.5 ba · 2,297 sqft · 0.064 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,825,000Mar 2021 $18,0912025 Amount on Record Jun 2014 2 Names on Record Assessor + 3 DocumentsUpdated May 2026

415 William St

2,929 sqft · Built 1923 · 0.095 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$3,000,000Oct 2018 $19,3272024 Amount on Record Dec 1987 1 Name on Record Assessor + 5 DocumentsUpdated Apr 2026

418 William St

3 bd · 3 ba · 1,852 sqft · 0.1 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$3,285,000Mar 2026 $23,1572025 Amount on Record Jan 2022 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Jul 2026

419 William St

6 units · Built 1933 · 323 sq ft

Last Sale Median Tax Bill Median Sale    
$515,000Sep 2021 $4,5572024 $515,0006 units    

421 William St

4 bd · 5 ba · 2,528 sqft · 0.095 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$2,450,000Mar 2021 $22,9852024 Amount on Record Oct 2013 2 Names on Record Assessor + 1 DocumentUpdated Dec 2025

508 William St

3 bd · 2 ba · 1,127 sqft · 0.076 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,270,000Feb 2011 $10,0352024 Amount on Record Jul 2003 2 Names on Record Owner Occupied AssessorUpdated Dec 2025

512 William St

2 bd · 1 ba · 1,794 sqft · 0.076 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$279,972May 2014 $11,3922024 Amount on Record Feb 1976 1 Name on Record AssessorUpdated Apr 2026

513 William St

3 bd · 3.5 ba · 3,029 sqft · 0.118 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$6,950,000Mar 2022 $25,4652024 Amount on Record Dec 2007 1 Name on Record Assessor + 1 DocumentUpdated Apr 2026

516 William St

3 bd · 3 ba · 2,790 sqft · 0.079 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$323,138May 2014 $13,6202024 Amount on Record Mar 1986 1 Name on Record AssessorUpdated Apr 2026

518 William St

2 bd · 2 ba · 1,485 sqft · 0.049 acres

Last Sale Tax Bill Prior Sale Owner Records
$392,500Apr 2009 $8,6122024 —Feb 2009 1 Name on Record AssessorUpdated Dec 2025

520 William St

3 bd · 3 ba · 1,388 sqft · 0.06 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,450,000Mar 2021 $11,5282024 Amount on Record Nov 2018 1 Name on Record Assessor + 4 DocumentsUpdated Dec 2025

522 William St

5 bd · 2 ba · 2,196 sqft · 0.092 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$3,0232024 1 Name on Record Owner Occupied Assessor + 1 DocumentUpdated Dec 2025

523 William St

3,687 sqft · Built 1909 · 0.312 acres

Last Sale Tax Bill Prior Sale Owner Records
$8492024 1 Name on Record Owner Occupied AssessorUpdated Dec 2025

526 William St

5 units · Built 1933 · 550 sq ft

Last Sale Median Tax Bill Median Sale    
$1,250,000May 2025 $6,1702024 $615,0005 units    

527 William St

1,582 sqft · Built 1925 · 0.052 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$4782024 1 Name on Record Owner Occupied AssessorUpdated Dec 2025

528 William St

3 bd · 3.5 ba · 3,338 sqft · 0.102 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$3,550,000Jun 2024 $25,0292025 —May 2010 2 Names on Record Assessor + 1 DocumentUpdated Jul 2026

529 William St

2 bd · 2 ba · 1,276 sqft · 0.05 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$500,000Dec 2014 $8,1652024 —Sep 2014 1 Name on Record AssessorUpdated Dec 2025

530 William St

6 bd · 4 ba · 3,318 sqft · 0.102 acres

Last Sale Tax Bill Prior Sale Owner Records
$1,650,000Feb 2018 $18,4152024 —Feb 2018 1 Name on Record Assessor + 1 DocumentUpdated Apr 2026

533 William St, #101

4 bd · 4 ba · 2,880 sqft · 0.059 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$99,000Apr 1982 $11,3952024 1 Name on Record AssessorUpdated Dec 2025

607 William St

2 bd · 2 ba · 960 sqft · 0.064 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$17,400Sep 2003 $4,5312024 Amount on Record Jun 2000 1 Name on Record Owner Occupied AssessorUpdated Apr 2026

611 William St

5 bd · 5 ba · 3,400 sqft · 0.081 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,400,000Oct 2018 $15,5842024 Amount on Record Jul 2001 1 Name on Record Assessor + 2 DocumentsUpdated Apr 2026

612 William St

5 bd · 2 ba · 2,531 sqft · 0.231 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
—Mar 2002 $10,4332024 Amount on Record Jun 1997 2 Names on Record Owner Occupied AssessorUpdated Dec 2025

613 William St

3 bd · 2 ba · 933 sqft · 0.046 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$750,000Jun 2010 $9,2842024 Amount on Record Feb 2000 2 Names on Record AssessorUpdated Dec 2025

615 William St

3 bd · 3 ba · 1,331 sqft · 0.053 acres

Last Sale Tax Bill Prior Sale Owner Records
—Mar 2015 $7,9392024 —Sep 2004 1 Name on Record AssessorUpdated Dec 2025

618 William St

3 bd · 3 ba · 1,794 sqft · 0.115 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$43,000Aug 1977 $15,2692024 1 Name on Record AssessorUpdated Apr 2026

619 William St

5 bd · 2 ba · 2,018 sqft · 0.135 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
—Mar 2015 $14,7712024 Amount on Record Jan 1996 1 Name on Record AssessorUpdated Dec 2025

620 William St

2 bd · 1 ba · 334 sqft · 0.051 acres

Last Sale Tax Bill Prior Sale Owner Records
$35,000Feb 1980 $6,0002024 1 Name on Record AssessorUpdated Apr 2026

622 William St

3 bd · 4 ba · 1,592 sqft · 0.07 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$817,000Jan 2021 $15,6182024 —Dec 2010 2 Names on Record Assessor + 1 DocumentUpdated Dec 2025

623 William St

3 bd · 3.5 ba · 2,397 sqft · 0.068 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$2,000,000Jul 2017 $24,1272025 Amount on Record Oct 2005 1 Name on Record Assessor + 1 DocumentUpdated May 2026

625 William St

3 bd · 3 ba · 1,187 sqft · 0.068 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$789,000Jun 2004 $10,0112024 1 Name on Record AssessorUpdated Dec 2025

626 William St

5 bd · 6 ba · 3,536 sqft · 0.164 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$6,500,000Sep 2023 $38,6732024 —Oct 2022 2 Names on Record Owner Occupied Assessor + 4 DocumentsUpdated Dec 2025

628 William St

3 bd · 2.5 ba · 1,524 sqft · 0.067 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$2,595,000Nov 2025 $17,2592024 Amount on Record Mar 2022 2 Names on Record Assessor + 5 DocumentsUpdated Aug 2026

629 William St

6 bd · 4 ba · 3,234 sqft · 0.151 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$42,500Feb 1972 $8,1632024 1 Name on Record AssessorUpdated Apr 2026

635 William St

3 bd · 4 ba · 1,588 sqft · 0.126 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,605,000Oct 2014 $18,3452024 Amount on Record Mar 2007 1 Name on Record AssessorUpdated Dec 2025

638 William St

1 bd · 1 ba · 621 sqft · 0.163 acres

Last Sale Tax Bill Prior Sale Owner Records
$13,3752024 1 Name on Record AssessorUpdated Dec 2025

639 William St

3 bd · 3 ba · 2,491 sqft · 0.173 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$215,000Dec 1986 $9,4102024 Amount on Record Feb 1977 1 Name on Record AssessorUpdated Jul 2026

643 William St

3 bd · 3 ba · 2,122 sqft · 0.162 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,700,000May 2007 $16,1932024 —Mar 2001 2 Names on Record Owner Occupied AssessorUpdated Dec 2025

646 William St

3 bd · 4 ba · 1,780 sqft · 0.1 acres

Last Sale Tax Bill Prior Sale Owner Records
$12,7592024 1 Name on Record AssessorUpdated Dec 2025

647 William St

8 bd · 9 ba · 3,916 sqft · 0.171 acres

Last Sale Tax Bill Prior Sale Owner Records
$750,000Feb 2001 $18,6922025 Amount on Record Jan 1982 1 Name on Record Owner Occupied AssessorUpdated Aug 2026

648 William St

1,523 sqft · Built 1928 · 0.064 acres

Last Sale Tax Bill Prior Sale Owner Records
—Oct 2000 $4,7152024 1 Name on Record AssessorUpdated Dec 2025

649 William St

6 bd · 6 ba · 3,437 sqft · 0.113 acres

Last Sale Tax Bill Prior Sale Owner Records
$2,500,000Apr 2022 $21,2982025 Amount on Record Oct 2020 1 Name on Record Assessor + 5 DocumentsUpdated Aug 2026

651 William St

4 units · Built 1933 · 494 sq ft

Last Sale Median Tax Bill Median Sale    
$600,000Jul 2025 $5,6962024 $600,0004 units    

651 William St

0.038 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$34,100Dec 1997 Amount on Record Mar 1994 1 Name on Record Owner Occupied AssessorUpdated Dec 2025

704 William St

3 bd · 1 ba · 1,656 sqft · 0.052 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,300,000Sep 2018 $10,1772024 Amount on Record Nov 2012 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Jul 2026

708 William St

4 bd · 3 ba · 1,967 sqft · 0.123 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,752,000Nov 2025 $7,7792024 Amount on Record Dec 1998 2 Names on Record Assessor + 5 DocumentsUpdated Aug 2026

710 William St

2 bd · 2 ba · 1,120 sqft · 0.054 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,325,000Jun 2025 $10,4392024 Amount on Record Mar 2006 1 Name on Record Assessor + 2 DocumentsUpdated Dec 2025

711 William St

1 bd · 2 ba · 1,009 sqft · 0.051 acres

Last Sale Tax Bill Prior Sale Owner Records
$675,000Mar 2004 $7,3562024 —Mar 1996 2 Names on Record Assessor + 1 DocumentUpdated Dec 2025

712 William St

2 bd · 2 ba · 1,188 sqft · 0.047 acres

Last Sale Tax Bill Prior Sale Owner Records
$625,000Nov 2003 $3,5972024 Amount on Record Oct 2000 1 Name on Record Owner Occupied Assessor + 3 DocumentsUpdated Aug 2026

715 William St

3 bd · 2 ba · 1,928 sqft · 0.103 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$340,000Mar 1988 $15,8232024 2 Names on Record Assessor + 2 DocumentsUpdated Dec 2025

716 William St

4 bd · 3 ba · 1,915 sqft · 0.122 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,320,000Aug 2014 $18,7992024 Amount on Record Jul 2003 1 Name on Record AssessorUpdated Dec 2025

1124 William St

3 bd · 2.5 ba · 1,789 sqft · 0.09 acres · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,000,000Jan 2010 $9,8642024 Amount on Record Feb 2006 2 Names on Record Owner Occupied Assessor + 1 DocumentUpdated Apr 2026

1175 William St

4 bd · 2.5 ba · 2,487 sqft · 0.118 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$1,100,000May 2017 $11,2622024 Amount on Record Feb 2011 2 Names on Record Assessor + 2 DocumentsUpdated Aug 2026

1207 William St, Apt 2

2 bd · 2 ba · 1,056 sqft · 0.167 acres

Last Sale Tax Bill Prior Sale Owner Records
$185,000Dec 2010 $3,5802024 1 Name on Record Owner Occupied Assessor + 4 DocumentsUpdated Dec 2025

1207 William St, Apt 3

2 bd · 2 ba · 1,216 sqft · 0.167 acres

Last Sale Tax Bill Prior Sale Owner Records
$625,000Jul 2021 $6,6092025 Amount on Record May 2013 2 Names on Record Owner Occupied Assessor + 2 DocumentsUpdated Jun 2026

1209 William St

5 units · Built 1928 · 486 sq ft

Last Sale Median Tax Bill Median Sale    
$620,000Mar 2025 $3,8502024 $445,0005 units    

1213 William St

2 bd · 1 ba · 2,392 sqft · 0.081 acres

Last Sale Tax Bill Prior Sale Owner Records
$430,000Jun 2013 $2,3942024 Amount on Record Nov 1997 1 Name on Record Owner Occupied AssessorUpdated Dec 2025

1219 William St

2 bd · 1 ba · 922 sqft · 0.124 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,250,000Aug 2023 $9,8762024 Amount on Record Nov 2018 1 Name on Record Assessor + 3 DocumentsUpdated Dec 2025

1221 William St

2 bd · 1 ba · 1,011 sqft · 0.124 acres

Last Sale Tax Bill Prior Sale Owner Records
$7,7842024 1 Name on Record Assessor + 1 DocumentUpdated Aug 2026

1308 William St

2 bd · 1 ba · 1,003 sqft · 0.083 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$4,000Mar 1996 $9,3712025 1 Name on Record Assessor + 1 DocumentUpdated May 2026

1310 William St

2 bd · 1 ba · 760 sqft · 0.055 acres

Last Sale Tax Bill Prior Sale Owner Records
$4,6452024 1 Name on Record AssessorUpdated Dec 2025

1312 William St

2 bd · 3 ba · 1,106 sqft · 0.063 acres

Last Sale Tax Bill Prior Sale Owner Records
$895,000Nov 2022 $7,8092024 Amount on Record Sep 2016 1 Name on Record Assessor + 1 DocumentUpdated Apr 2026

1314 William St

1 bd · 1 ba · 1,246 sqft · 0.078 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$383,000Apr 2012 $5,2882024 Amount on Record Feb 2005 1 Name on Record Owner Occupied AssessorUpdated Jul 2026

1315 William St

3 bd · 1 ba · 930 sqft · 0.121 acres · Garage · Pool

Last Sale Tax Bill Prior Sale Owner Records
$40,000Jan 2004 $10,6002025 Amount on Record Mar 1998 1 Name on Record Assessor + 3 DocumentsUpdated Aug 2026

1318 William St

2 bd · 1 ba · 899 sqft · 0.16 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,250,000Feb 2024 $10,5162024 Amount on Record Nov 1996 1 Name on Record Assessor + 1 DocumentUpdated Apr 2026

1319 William St

6 bd · 6,542 sqft · 0.299 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$1,995,000Sep 2024 $27,7122024 Amount on Record Jul 2018 1 Name on Record Assessor + 4 DocumentsUpdated Dec 2025

1321 William St

4 bd · 4 ba · 3,168 sqft · 0.192 acres · Garage

Last Sale Tax Bill Prior Sale Owner Records
$150,000Apr 1986 $14,6522024 Amount on Record Feb 1974 2 Names on Record AssessorUpdated Apr 2026

Wildfire Risk on William St

Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020

Wildfire RiskNot rated
no burnable land in reach
Wildfire LikelihoodNegligible
ExposureNone
beyond ember reach of burnable land

Property Records in Nearby Streets