Date
Details
Price
Change
Source
7/27/2026
Listed
$1,399,000
—
MLS
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
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$1,399,000 Just Listed
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Join us at 643 Main St on:
- Open House: 11:00 AM - 12:30 PM
Saturday 8/1 11:00 AM - 12:30 PM
643 Main St,Harwich, MA 02645643 Main StHarwichMA02645 - Open House: 11:00 AM - 12:30 PM
Sunday 8/2 11:00 AM - 12:30 PM
643 Main St,Harwich, MA 02645643 Main StHarwichMA02645
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Property Description
A rare opportunity in Harwich Center! Set on approximately 1.5 acres, this one-of-a-kind property offers endless possibilities with a main home, a separate ADU with its own private driveway, and a detached mixed-use garage. With a total of 6 bedrooms, it's ideal for multigenerational living, extended family, or guests, while the ADU also provides excellent rental history. The detached garage offers incredible flexibility for a business, workshop, storage, hobby space, or additional rental opportunity, with plenty of room for vehicles, bikes, and tools. Outside, enjoy a beautifully landscaped backyard with multiple sheds ready to become a man cave, she shed, home bar, art studio, or your own private retreat around the fire pit. Properties offering this much space, versatility, and potential rarely come to market in Harwich Center. Don't miss your chance to make this truly unique property yours!
Full Property Details
Full Property Details for 643 Main St
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General
- Price: $1,399,000
- Taxes: $5,664 (2026)
- Status: Active
- Type: Single Family
- MLS ID: 73555500
- Updated: 7/27/2026
- Added to Site: 2 day(s) ago
Rooms
Bathrooms
- Total Bathrooms: 3
- Full Bathrooms: 3
- Bathroom 1: 11.70 x 5.40, First
- Bathroom 2: 6.90 x 8.40, Second
Bedrooms
- Total Bedrooms: 6
- Primary Bedroom: 11.70 x 17.10, First
- Bedroom 2: 14.00 x 11.20, Second
- Bedroom 3: 10.30 x 11.11, Second
- Bedroom 4: 9.40 x 8.40, Second
Other Rooms
- Living Room: 18.60 x 11.60, First
- Family Room: 21.80 x 27.30, First
- Kitchen: 16.50 x 11.70, First
- Dining Room: 10.80 x 11.70, First
- Office: 9.10 x 11.60, First
Parking
- Garage: Yes
- Garage Spaces: 2
- Parking Features: Detached, Garage Door Opener, Heated Garage, Workshop in Garage, Off Street, Paved
Location
- County: Barnstable
Structural Information
- Architectural Style: Cape
- Basement: Yes
- Square Feet: 2,872
- Year Built: 1919
Lot Features
- Lot Size (Acres): 1.43
Financial Considerations
- Tax Amount: $5,664
- Tax Year: 2026
Disclosures and Reports
- Property ID: M:0040 B:0000 L:00E40, 2334131
Listed by Keller Williams Realty, Richard J. Waystack
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Listing agent
— 643 Main St —
Richard J. Waystack
Keller Williams Realty
NMLS#: 1598647Get Pre-Approved Today
Schools
Schools serving 643 Main St
School District:Monomoy Regional School District
| Name | Grades | Distance |
|---|---|---|
Harwich Elementary School 263 South Street, Harwich, MA 02645 | PK-4 | 0.2 mi |
Monomoy Regional Middle School 425 Crowell Road, Chatham, MA 02633 | 5-7 | 5.7 mi |
Monomoy Regional High School 75 Oak Street, Harwich, MA 02645 | 8-12 | 0.8 mi |
Disclaimer:
School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.
Price & Sales History for 643 Main St
Tax History
Tax History for 643 Main St
Year
Property Taxes
Change
Tax Assessment
Change
2025
$5,599
6%
$947,300
8%
2024
$5,286
4%
$876,600
14%
2023
$5,107
2%
$769,100
24%
2022
$5,020
-2%
$619,000
4%
2021
$5,108
1%
$593,900
2%
2020
$5,067
3%
$580,400
3%
2019
$4,901
8%
$565,300
12%
2017
$4,520
3%
$503,900
4%
2016
$4,394
3%
$484,400
2%
2015
$4,266
4%
$475,600
1%
2014
$4,112
—
$468,900
—
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
Estimate the Cost
Estimate the Cost for 643 Main St
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- Single Family
- Active
- Updated 3 days ago
- 6Beds
- 4Total Baths
- 2,960Sq. Ft.
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- Condo
- Active
- Updated 4 days ago
- 2Beds
- 2Total Baths
- 935Sq. Ft.
- Single Family
- Active
- Updated 15 hours ago
- 3Beds
- 2Total Baths
- 1,372Sq. Ft.
- Single Family
- Active
- Updated 2 days ago
- 3Beds
- 2Total Baths
- 2,064Sq. Ft.
- Single Family
- Active
- Updated 17 hours ago
- 3Beds
- 3Total Baths
- 1,440Sq. Ft.
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- Single Family
- Active
- Updated 2 days ago
- 4Beds
- 3Total Baths
- 1,456Sq. Ft.
- Single Family
- Active
- Updated 6 days ago
- 4Beds
- 6Total Baths
- 5,372Sq. Ft.
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643 Main St, Harwich, MA 02645 (MLS# 73555500) is a Single Family property with 6 bedrooms and 3 full bathrooms. 643 Main St is currently listed for $1,399,000 and was received on July 27, 2026. Want to learn more about 643 Main St? Do you have questions about finding other Single Family real estate for sale in Harwich? You can browse all Harwich real estate or contact a Coldwell Banker agent to request more information.