I'm sure I missed one here and there, but here's what I came up with.
Marin, CA (I-580)
San Mateo, CA (I-280, I-380)
Santa Clara, CA (I-280, I-680, I-880)
Franklin, WA (I-182)
Carson City, NV (I-580)
McPherson, KS (I-135)
Harvey, KS (I-135)
Dakota, NE (I-129)
Douglas, WI (I-535)
Black Hawk, IA (I-380)
Buchanan, IA (I-380)
Benton, IA (I-380)
Linn, IA (I-380)
Adams, IL (I-172)
Putnam, IL (I-180)
Monroe, IL (I-255)
Allegan, MI (I-196)
Poinsett, AR (I-555)
Craighead, AR (I-555)
Jefferson, AR (I-530)
Madison, AL (I-565)
Dyer, TN (I-155)
Campbell, KY (I-275, I-471)
Butler, KY (I-165)
Ohio, KY (I-165)
Daviess, KY (I-165)
Hall, GA (I-985)
Pickens, GA (I-575)
Muscogee, GA (I-185)
Pinellas, FL (I-175, I-275, I-375)
Brunswick, NC (I-140)
Wayne, NC (I-795)
City of Suffolk, VA (I-664)
City of Hopewell, VA (I-295)
City of Roanoke, VA (I-581)
City of Portsmouth, VA (I-264)
Montgomery, MD (I-270, I-370, I-495)
Lycoming, PA (I-180)
Clermont, OH (I-275)
Monmouth, NJ (I-195)
Ocean, NH (I-195)
Niagara, NY (I-190)
Livingston, NY (I-390)
Richmond, NY (I-278)
Kings, NY (I-278, I-478)
Queens, NY (I-278, I-495, I-678, I-878)
Nassau, NY (I-495)
Suffolk, NY (I-495)
Plymouth, MA (I-195, I-495)
Sagadahoc, ME (I-295)
Chris