District 4 Supervisor Karen Mitchoff

Hello and welcome to the District IV website! As your County Supervisor, I was elected to serve the diverse communities of Clayton, Concord, Pleasant Hill, part of Walnut Creek, and the unincorporated Contra Costa Centre.

District IV is located in the beating heart of Contra Costa County. We have seen great transformation in our communities in a few short years, as innovation, prosperity, and new residents join us in the shadow of Mt. Diablo. Mindful of these developments, it is my core focus to build policies that best serve you, my constituents in District IV, and our neighbors across Contra Costa.

I am committed to better connecting the people of Contra Costa County with the vital services of government, and advocating for policies that will help our communities grow and prosper. 

I look forward to hearing from you.

Karen Mitchoff

                                              County Initiatives to Follow

Oak Park Properties Project
(Pleasant Hill Library)


The new Pleasant Hill Library is being designed by the award-winning firm Bohlin Cywinski Jackson (BCJ), with extensive community input throughout the design process. The design documents are nearing completion. Construction activities are expected to begin in late 2019, with a grand opening in spring 2021.

The vision for the library is a place where people of all ages can explore, learn and connect. As visitors go through the entry doors, they will find an open central space to support a collection of 70,000 items, and spaces for reading, storytelling, accessing technology, collaborating and gathering. There will be a special “maker space” for hands-on creativity, and outdoor spaces for reading and play. A bookstore will showcase high-quality used books being sold by the Friends of the Pleasant Hill Library, and the Café Vibe will offer a comfortable area to bring a snack and chat with friends.

How will library services be provided during the interim?

A temporary library will be located at the Pleasant Hill Senior Center. While details are still being worked out, some highlights include:

  • Approximately 10,000 items available for check-out at the temporary library, including DVDs and the popular “Lucky Day” collection of new books
  • Access to computers
  • Library staff on hand to assist with everything from book recommendations to online searches
  • Storytimes 5 mornings a week at the Pleasant Hill Teen Center
  • The ability to order materials from ccclib.org and pick them up at the temporary Library
  • A regular column in the Outlook by Patrick Remer (Senior Community Library Manager) with news about special community events and library happenings

Read More Here


Area Agency on Aging Survey Flyer

Screen Shot 2019-04-10 at 11.10.19 AM

Safe Drug Disposal
DocumentContra Costa Meds Coalition

To make sure that unused medication is disposed of correctly, pharmacies, police departments, and hospitals across the county will accept and dispose of any unused pharmaceuticals and pills. Disposal kiosks can be found at the following locations in District IV.

CVS/Pharmacy #09815
738 Bancroft Rd
Walnut Creek, CA 94598
(925) 938-8525

Walgreens
2900 N. Main St.
Walnut Creek, CA 94597
(925) 933-0307

Kaiser Permanente Walnut Creek Medical Center
1425 S. Main St.
Walnut Creek, CA 94597
925-295-4000

Kaiser Health Park Shadelands Phy 501
320 Lennon Lane
Walnut Creek, CA 94598
(925) 906-2500

City of Walnut Creek, Police Department
City Hall 1666 North Main
Walnut Creek, CA 94598
(925) 943-5844

City of Pleasant Hill, Police Department
330 Civic Dr.,
Pleasant Hill, CA 94523
(925) 288-4600

City of Concord, Police Department
1350 Galindo Street
Concord, CA 94520
(925) 671-3220

CVS/Pharmacy #9238
2677 Clayton Rd
Concord, CA 94519
(925) 689-2398

CVS/Pharmacy #09509
4424 Treat Blvd
Concord, CA 94521
(925) 676-4040

CVS/Pharmacy #09827
5408 Ygnacio Valley Rd
Concord, CA 94521
(925) 672-0646

CVS/Pharmacy #6526
6490 Clayton Rd
Clayton, CA 94517
(925) 673-2803

City of Clayton, Police Department,
City Hall 6000 Heritage Trail,
Clayton, CA 94517
(925) 673-7350


2020 Census Planning in Contra Costa County

2020 Census Planning

Idle Free Pledge Idle Free 2017

The Contra Costa County Board of Supervisors is the first local government in the Bay Area to go idle free. On April 25, in conjunction with Earth Day, each member of the Board of Supervisors took the Idle Free Pledge. I'm proud to have led this effort with my colleagues!

Transportation from vehicles is one of the largest sources of air pollution in Contra Costa County, representing 47 percent of total greenhouse gas emissions in 2013. These emissions have negative impacts on our health, including aggregated asthma, coughing or difficult breathing, decreased lung function, cardiovascular problems, and bronchitis. The U.S. Department of Energy estimates that idling in personal vehicles wastes about three billion gallons of fuel annually.