643 William St, Key West, FL 33040
Property image
Property image
OFF MARKET

643 William St
Key West, FL 33040

Old Town
  • 3 Beds
  • 3 Baths
  • 2,122 sqft

$2,983,500

Trulia Estimate
as of Aug 18, 2026
Est. Refi. Payment $17,247/mo*

$2,983,500

Trulia Estimate
as of Aug 18, 2026
Est. Refi. Payment $17,247/mo*
3 Beds
3 Baths
2,122 sqft

Home Value

Trulia Estimate
$2.98M
Since last month
Increased$2K (+0.1%)
Since last year
Increased$99K (+3.4%)
Since last sale
Increased$1M (+77.7%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +102% in the last 10 years
MonthEstimated value
2026
August 2026$3.02M
July 2026$3.02M
June 2026$3.1M
May 2026$3.08M
April 2026$3M
March 2026$2.93M
February 2026$2.97M
January 2026$2.85M
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
0.13
Single-Family Home
$3,250,000
05/27/26
3
3
2,188
0.04
Single-Family Home
$2,525,000
04/27/26
3
3
1,600
0.16
Single-Family Home
$3,150,000
09/19/25
3
3
2,100
0.05
Single-Family Home
$2,595,000
11/13/25
3
2.5
1,524
0.41
Single-Family Home
$1,695,000
04/10/26
3
3
1,553
0.28
Single-Family Home
$1,825,000
02/20/26
3
2.5
1,681
0.11
Single-Family Home
$2,600,000
09/26/25
3
2
1,223
0.25
Single-Family Home
$3,400,000
11/07/25
3
3.5
1,890
0.23
Single-Family Home
$3,350,000
12/03/25
3
3.5
2,438
0.37
Single-Family Home
$1,500,000
02/03/26
3
2.5
1,667

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
0.03
$2,989,700
5
4.5
2,392
Off Market
0.03
$2,163,100
3
3
2,130
Off Market
0.03
$2,150,000
3
2
1,200
For Sale
0.04
$2,525,000
3
3
1,600
Recently Sold
0.03
$605,000
1
1
599
Off Market
0.05
$2,187,400
2
2
1,376
Off Market
0.05
$1,374,600
2
2
860
Off Market
0.05
$1,277,200
2
1
974
Off Market
0.04
$865,000
2
1
723
Recently Sold
0.06
$1,438,000
2
2
796
Off Market
0.05
$1,333,700
2
2
1,060
Off Market
0.07
$1,590,000
3
1.5
1,392
Recently Sold

Local Information

  • Map ViewExplore the area around 643 William St.
  • Schools1 Preschool School1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Single-Family Home
Year Built
1938
Living Area
2,122 sqft
Price/Sqft
$1,406

About this House

This single-family home is located at 643 William St, Key West, FL. 643 William St is in the Old Town neighborhood in Key West, FL and in ZIP code 33040. This property has 3 bedrooms, 3 bathrooms and approximately 2,122 sqft of floor space. This property has a lot size of 7405 sqft and was built in 1938.
643 William St, Key West, FL 33040 is a 3 bedroom, 3 bathroom, 2,122 sqft single-family home in Old Town, built in 1938. It last sold for $1,700,000 on May 14, 2007. It is currently off market. The Trulia Estimate is $2,983,500, with a rent estimate of $7,713/month.

Home Details for 643 William St

Interior Features

Heating & Cooling
Heating: Forced AirHeating Fuel: Forced Air
Levels, Entrance, & Accessibility
Stories: 2Floors: Softwood, Hardwood

Exterior Features

Exterior Home Features
Roof: MetalExterior: WoodFoundation Type: Concrete
Pool
Pool

Property Information

Year Built
Year Built: 1938Year Updated: 1998
Property Type / Style
Property Type: Single Family Home

Community

Units in Building: 1

Lot Information

Lot Area: 7091 sqft

Price and Tax history

DateEventPrice
May 14, 2007
Source: FLKMLS #103300
Sold
$1,700,000
Oct 13, 2006
Source: N/A
Sold
$1,700,000

Market trends in Key West

Last updated July 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$1.28M
$50K
MoM
Sale-to-List Price
95.1%
0.5%
MoM
Price per sq ft
$933
$26
MoM
Available listings
271
17
MoM
Skip to last item
  • Results are loading
Skip to first item

Neighborhood Overview

Neighborhood stats provided by third party data sources.

What Locals Say about Old Town

At least 1 Trulia users voted on each feature.
  • 100 % Say it's dog friendly

  • 100 % Say people would walk alone at night

  • 100 % Say there are sidewalks

  • 100 % Say streets are well-lit

  • 100 % Say neighbors are friendly

  • 100 % Say it's quiet

  • 100 % Say it's walkable to grocery stores

  • 100 % Say it's walkable to restaurants

  • 100 % Say parking is easy

  • 100 % Say car is needed

  • 67 % Say there's holiday spirit

  • 60 % Say they plan to stay for at least 5 years

  • 50 % Say there are community events

  • 50 % Say kids play outside

Sourced by Trulia users. Learn more about our methodology.
  • David Atkinson
    "I so look forward to getting to Key West. I volunteer at the Tropic and love it. It feels like home."
  • Trulia User
    "Dogs are welcomed at 90% of the restaurants. Everyone will remember your dogs name but not yours! I love living here with my dog Jack."
  • Trulia User
    "Key West is a huge dog community. They even are allowed in some restaurants . When I walk my dog on the main tourist street (Duval St) I get stopped many times from people wanting to pet my dog. A group of dog owners meet up at the park in the morning every day."
  • Sgarvin3281
    " Bikes are all you need small island. Safe and secure. No commute I do t work here it is a vacation community."
  • Trulia User
    "Everywhere dogs are welcome here in key west, Florida. Come joining us here in key west. Most food and service places, boats, and entertainment venues are good with dogs."
  • Trulia User
    "Feels very safe, super clean, super walkable in old town, and Catholic school looks very vibrant. "
  • Trulia User
    "Great people, great neighborhood, great police, family friendly events. Lots of things to do within a decent drive. Very family friendly generally "
  • Key W. B. F.
    "Gatherings on the local Mangia Mangia bench at 900 Southard street, safe & friendly town. Feel connected & welcomed in Key West. Enjoy the peaceful neighborhood & the tropical weather! You can walk or bike to everything you need & want!"
  • Kfowler
    "I am not currently aware of any neighborhood events that would bring the neighbors closer. However, both my husband and I would be open to any such event that would do so and would improve the neighborhood. The area is beautiful and well maintained, with a few exceptions. "
  • Hannah B.
    "Vintage Cottage houses, small island feel, Duval Street in a few minutes with hundreds of worldly trendy restaurants "
  • Drlynmar
    "Neighborhood newsletter. Proximity to OldTown events, festivals and parades. Walk to everything. Parks, beaches, dog park. Grocery and restaurant delivery. "
  • Venomousink1970
    "the neighborhood is great I myself do not like living in Key West anymore and looking to relocate and Asheville North Carolina or the surrounding areas people are very friendly here except for the homeless vagrants that beg for money and yell at you when you don't give them any"
  • Lorettamdt
    "Old Town is historic. Our neighbors are friendly. We walk everywhere. No need for a car. Restaurants are within walking distance. Beaches are a bicycle ride away. "
  • mangiamangia
    "Lived in this neighborhood for 25 years. Walk and anywhere. Far enough of Duval to escape the noise and drunks."
  • Sajsk
    "vacationed in that area -- charming and great location and amenities, yet quiet."
  • Rjones
    "This is a great street and great neighborhood. Qiet, yet close enough to Duval and White streets to enjoy all Key West has to offer. "

LGBTQ Local Legal Protections

Apartments for Rent

Skip to last item
Skip to first item

Explore by feature - Pet Friendly

Explore by feature - Garage

Explore by feature - Air Conditioning

Explore by feature - Pool

Explore by feature - Washer/dryer

Explore by feature - Outdoor Space

Homes for sale near 643 William St

Skip to last item
Skip to first item

Off Market Homes Near 643 William St

Skip to last item
Skip to first item

Frequently asked questions about 643 William St

  • What is 643 William St estimated to be worth?
    Trulia's estimated value for 643 William St in Key West, FL is $2,983,500.
  • What is the price history for 643 William St?
    643 William St in Key West, FL last sold for $1,700,000 in May 2007.
  • Is Key West a buyer's or seller's market?
    Key West is currently a buyer's market, based on recent for-sale activity.
  • What's the median sale price in Key West?
    The median sale price in Key West is $1.28M. That is up $50K from the prior month.
  • Does 643 William St have a pool?
    Yes, 643 William St in Key West, FL has a pool.
  • How big is the lot at 643 William St?
    The lot at 643 William St in Key West, FL is about 0.17 acres (7,405 sq ft).