21639 Lost River Dr, Diamond Bar, CA 91765
OFF MARKET

$967,400

Trulia Estimate
  • 4 Beds
  • 2 Baths
  • 1,588 sqft

21639 Lost River Dr, Diamond Bar, CA 91765

Est. Refi. Payment $6,108/mo*
Refinance Your Home

Home Value

Trulia Estimate
$967K
Since last month
Decreased$16K (-1.6%)
Since last year
Increased$17K (+1.8%)
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 +57% in the last 10 years
MonthEstimated value
2026
August 2026$968K
August 2026$967K
July 2026$984K
June 2026$977K
May 2026$977K
April 2026$976K
March 2026$1M
February 2026$990K
January 2026$962K
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
2421 Castle Rock Rd, Diamond Bar, CA
0.08
Single-Family Home
$959,000
12/12/25
3
2
1,300
2124 Tierra Loma Dr, Diamond Bar, CA
0.19
Single-Family Home
$1,000,000
09/16/25
4
2
1,696
2463 Harmony Hill Dr, Diamond Bar, CA
0.22
Single-Family Home
$1,300,000
02/06/26
4
2
1,831
2624 Crooked Creek Dr, Diamond Bar, CA
0.28
Single-Family Home
$1,030,000
10/16/25
4
2
1,688
2127 Evergreen Springs Dr, Diamond Bar, CA
0.29
Single-Family Home
$958,600
07/16/26
3
2
1,372
1869 Morning Canyon Rd, Diamond Bar, CA
0.38
Single-Family Home
$1,290,000
05/04/26
4
2
1,788
2013 Morning Canyon Rd, Diamond Bar, CA
0.31
Single-Family Home
$1,158,000
01/26/26
4
2
1,881
2606 Castle Rock Rd, Diamond Bar, CA
0.33
Single-Family Home
$975,000
07/31/26
3
2
1,300
1826 Wellspring Dr, Diamond Bar, CA
0.45
Single-Family Home
$1,152,000
10/29/25
4
2
1,708
2710 Castle Rock Rd, Diamond Bar, CA
0.49
Single-Family Home
$1,030,000
02/27/26
4
2
1,756

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
21711 Lost River Dr, Diamond Bar, CA 91765
0.03
$1,064,200
4
2
1,315
Off Market
21725 Lost River Dr, Diamond Bar, CA 91765
0.06
$1,348,880
4
2.5
1,813
For Sale
21624 Birch Hill Dr, Diamond Bar, CA 91765
0.07
$1,058,000
4
2
1,288
For Sale
2421 Castle Rock Rd, Diamond Bar, CA 91765
0.08
$959,000
3
2
1,300
Recently Sold
21648 Laurelrim Dr #D, Diamond Bar, CA 91765
0.11
$625,000
3
2
1,136
Recently Sold
21600 Laurelrim Dr #B, Diamond Bar, CA 91765
0.11
$488,888
2
1
914
Recently Sold
21696 Laurelrim Dr #D, Diamond Bar, CA 91765
0.11
$650,000
3
1.5
1,136
Recently Sold
2501 Reata Pl, Diamond Bar, CA 91765
0.16
$2,650,000
5
4.5
4,850
Recently Sold
21772 Laurelrim Dr #A, Diamond Bar, CA 91765
0.14
$550,000
2
1
869
Recently Sold
21750 Laurelrim Dr #A, Diamond Bar, CA 91765
0.15
$566,000
2
1
869
Off Market
2350 Presado Dr #D, Diamond Bar, CA 91765
0.15
$646,200
3
2
1,136
Off Market
21715 Laurelrim Dr #D, Diamond Bar, CA 91765
0.15
$674,600
3
1.5
1,136
Off Market

Local Information

  • Map ViewExplore the area around 21639 Lost River Dr.
  • Schools1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Single-Family Home
Built in 1963
1,588 sqft
$609/sqft

About this House

This single-family home is located at 21639 Lost River Dr, Diamond Bar, CA. 21639 Lost River Dr is in Diamond Bar, CA and in ZIP code 91765. This property has 4 bedrooms, 2 bathrooms and approximately 1,588 sqft of floor space. This property has a lot size of 9011 sqft and was built in 1963.
21639 Lost River Dr, Diamond Bar, CA 91765 is a 4 bedroom, 2 bathroom, 1,588 sqft single-family home built in 1963. This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $967,400, with a rent estimate of $4,451/month.

Home Details for 21639 Lost River Dr

Interior Features

Levels, Entrance, & Accessibility
Stories: 1
Interior Details
Number of Rooms: 10

Property Information

Year Built
Year Built: 1963Year Updated: 1964
Property Type / Style
Property Type: Single Family HomeArchitecture: Conventional

Exterior Features

Pool
Pool
Parking & Garage
Parking Space: 1

Community

Units in Building: 1

Lot Information

Lot Area: 9011 sqft

Price and Tax history

YearProperty taxTax assessment
2026Unavailable
$99,445
Home facts updated by county records

Market trends in Diamond Bar

Last updated August 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$1.08M
$21.33KMoM
Sale-to-List Price
99.0%
0.3%MoM
Price per sq ft
$560
$6MoM
Available listings
193
10MoM

Around this home

What Locals Say about Diamond Bar

At least 314 Trulia users voted on each feature.

  • 89 % Say it's dog friendly

  • 88 % Say there are sidewalks

  • 85 % Say car is needed

  • 80 % Say streets are well-lit

  • 78 % Say parking is easy

  • 77 % Say yards are well-kept

  • 74 % Say it's quiet

  • 66 % Say there's holiday spirit

  • 65 % Say people would walk alone at night

  • 64 % Say there's wildlife

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

  • 50 % Say kids play outside

  • 48 % Say it's walkable to grocery stores

  • 47 % Say neighbors are friendly

  • 45 % Say it's walkable to restaurants

  • 25 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • 4szj5yrwps
    "Diamond Bar, California, is a distinctive suburban community in eastern Los Angeles County, offering a unique blend of natural beauty, cultural diversity, and modern amenities. The city is characterized by its rolling hills, scenic landscapes, and well-maintained parks, providing residents with ample opportunities for outdoor recreation. Notable parks include Sycamore Canyon Park and Summitridge Park, both offering hiking trails with picturesque views of the San Gabriel Mountains. ๏ฟผ The communityโ€™s cultural diversity is reflected in its vibrant culinary scene, featuring a wide array of international cuisines. Events such as the annual Family Festival showcase this diversity through live music, carnival games, and food vendors, fostering a strong sense of community among residents. ๏ฟผ Education is a cornerstone of Diamond Bar the unique combination of natural beauty, cultural richness, educational excellence, and forward-thinking initiatives make it a standout community within the greater Los Angeles area."
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  • Linda Correa
    "School district, bad traffic, no food variety, city does not help girls softball, no entertaining, safe neighborhood."
    0
    Flag
  • hubby pie
    "Safe and quiet. Many families live here and school district is top notch if you are in Walnut Valley Unified School District. That covers about half of Diamond Bar. The other district is good but not as good as Walnut."
    0
    Flag
  • Trulia User
    "Plenty of dog owners in the neighborhood. Everyone is polite to pick up their dogs poop as well as training friendly dogs."
    0
    Flag
  • hubby pie
    "Diamond Bar is a great city with plenty of parks, quiet neighborhoods and excellent shopping and dining. Schools are top notch."
    0
    Flag
  • hubby pie
    "Diamond Bar is a safe and friendly community. People care about the community and are proud of this community."
    2
    Flag
  • hubby pie
    "easy commute with two freeways passing through the community so access to LA, OC, and IE are as easy as it gets."
    0
    Flag
  • Madelynnpf
    "I lived in this neighborhood for almost 30 years and canโ€™t imagine living anywhere else. Itโ€™s quiet and a great place to rise a family."
    1
    Flag
  • Alexis T.
    "Dogs are welcome in this neighborhood. Everyone cleans up after themselves, keeping the neighborhood tidy. The only thing I can think of is that there are sometimes mountain lions and hawks present which is dangerous for small dogs"
    12
    Flag
  • Romoguadalupe
    "there are many wonderful hiking trails in the area with beautiful views. If you love nature, you'll love DB. "
    1
    Flag
  • Deanna L. R.
    "The yearly Firework show in the park is always nice. The Diamond Bar birthday celebration is a lot of fun as well. "
    0
    Flag
  • Hemming L. A.
    "Iโ€™ve lived in this neighborhood for 40 years and itโ€™s a great place to live. Lots of hiking trails and 30 minutes to downtown or the beach."
    0
    Flag
  • Nicholesaralegui
    "I like this place very family and friendly. kids have greats activity here in city. we live this place"
    0
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  • Lauren B.
    "Commute is not too bad. I drive my own vehicle. It only gets congested on Diamond Bar Blvd or Grand Ave but otherwise driving in Diamond Bar is pleasant "
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  • Raymond W.
    "Diamond Bar is the safest city Iโ€™ve ever lived in. Also, it has many schools and parks! Very family oriented. "
    3
    Flag
  • Oryaan53
    "my family has lived in this neighborhood for 10plus years and its always been a nice quiet , safe and friendly place to live "
    1
    Flag
  • Shengbinmi
    "Some of them allow dogs to walk around by themselves in front of their houses, but the dogs are actually very friendly."
    0
    Flag
  • Trulia User
    "Lots of open space and parks. Lots of sidewalks with trees. There are pet friendly parks and houses. "
    1
    Flag
  • Evelyn G. D. L. C.
    "A lot of cars speed down Pathfinder, otherwise its a very safe neighborhood. The schools are good. Neighbors are friendly. "
    0
    Flag
  • Nicholesaralegui
    "we have amazing neighbors and love the community. the city offers a lot of family activities for everyone."
    0
    Flag
  • Vickiwj
    "Festival, movie night, fireworks, recreational activities, library events, many scenic trails, dog parks, "
    0
    Flag
  • Nicholesaralegui
    "the city is wonderful for family activities. we love this city and all it has to offer. its a great place to raise a family."
    0
    Flag
  • Hemming L. A.
    "Iโ€™ve lived here for 40 years. Plenty of hiking trails, 30 minutes from LA, 40 min from the beach. Good area."
    1
    Flag
  • Allyawsome01
    "Good transportation not too much traffic nice people nice area beautiful place to raise a family. Amazing schools"
    0
    Flag
  • Christine B.
    "My neighborhood is clean and has very respectable and friendly residents. I feel very safe living here."
    0
    Flag
  • Ashley S.
    "Driving is the main means of transportation. There is a metro station as well as bus stops. However, most people drive."
    0
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  • Wlcastellanos
    "Lots of places to walk your dog...plenty of parks. A few people do not pick up after their dogs but most do and care for the neighborhood."
    0
    Flag
  • Nathan Q.
    "We have young whipper snappers race their cars up and down the street at all hours of the night. As a community we all take turns calling the sheriffs department on them. "
    1
    Flag
  • Steveji1019
    "Neighborhood with quite a lot of Asian cultures. Schools are some of the best around. Middle class to upper middle class families. "
    0
    Flag
  • Tahir P.
    "I work in Diamond Bar, my job is less than 3 miles from my house, but still my commute is 15 minutes at times on a good day (no red lights) 7 mins is as fast as I can get to work which is awesome. Lots of cars on main roads (Grand and Diamond Bar) every morning. People going to schools /work. "
    1
    Flag
  • Joel P.
    "Diamond bar is perfectly located at the intersection of 3 major freeways. 57 ,60, and 10. and very close to the 210. I use all of these in my commute making Diamond bar ideal for my line of work. "
    1
    Flag
  • Christine
    "Summer movie nights, Fourth of July celebrations, avid long-time spirited Halloween, farmerโ€™s markets. "
    0
    Flag
  • Ethan Y
    "Yes, they would like living in my area. There are many people walking their dogs in my community. But I donโ€™t like dog barking"
    0
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  • Kenny O.
    "Quiet area, but be careful of home invasion robbers. Always closed garage doors, and entry points of your home."
    0
    Flag
  • Polly Anderson
    "There are frequent car crashes and dangerous drivers running red lights and just causing close calls."
    0
    Flag
  • Su S.
    "This is a Good place. Good high school near by. Neighborhood are friendly. I really love this community. Pet friendly. Easy to go freeway. "
    0
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  • Andy M
    "Not much. Just a bedroom community. But I like it the way it is. There have been little.changes in the past ten years other than two small new developments. "
    0
    Flag
  • Tahir P.
    "Cut down to 7 mins as opposed to 45-60 mins one way , the mornings can be a little annoying with the 2 minute signals on main roads"
    0
    Flag

LGBTQ Local Legal Protections

Frequently asked questions about 21639 Lost River Dr

  • What is 21639 Lost River Dr estimated to be worth?
    Trulia's estimated value for 21639 Lost River Dr in Diamond Bar, CA is $967,400.
  • Is Diamond Bar a buyer's or seller's market?
    Diamond Bar is currently a balanced market, based on recent for-sale activity.
  • What's the median sale price in Diamond Bar?
    The median sale price in Diamond Bar is $1.08M. That is down $21.33K from the prior month.
  • What do residents say about Diamond Bar?
    Residents describe Diamond Bar, CA as dog-friendly, pedestrian-friendly, and easy to park in. See recently sold homes in Diamond Bar, CA.
  • Does 21639 Lost River Dr have a pool?
    Yes, 21639 Lost River Dr in Diamond Bar, CA has a pool.
  • How big is the lot at 21639 Lost River Dr?
    The lot at 21639 Lost River Dr in Diamond Bar, CA is about 0.21 acres (9,011 sq ft).

Explore by feature - Pet Friendly

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Explore by feature - Pool

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Explore by feature - Outdoor Space

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