Highest speed limit in your county?

[Roadgeekteen]

65 on parts of I-95.

[Max Rockatansky]

70 MPH on CA 99 and I-5. 

[Ben114]

65 on highways, other than that it would be MA 140 in Shrewsbury at 55.

[sprjus4]

For Virginia, assuming independent cities would be the equivalent.

60 mph on I-64, I-664, I-464, and US-58.

For Hampton Roads overall, 70 mph on I-64 in York County and James City County.

[ozarkman417]

70 on the one interstate in my county (Greene County, MO), I-44.

[sprjus4]

70 on the one interstate in my county (Greene County, MO), I-44.

Isn't US-60 also 70 mph?

[ozarkman417]

70 on the one interstate in my county (Greene County, MO), I-44.

Isn't US-60 also 70 mph?

Briefly, as it turns off the freeway about 3.5 miles after the increase (MO 360 takes its place, and is 70MPH for its entire length), but one problem with this thread is the amount of ties there can be.

[oscar]

Surprisingly enough, a short segment of the I-395 express lanes within Arlington County VA (from around Glebe Rd. to the independent city limits of Alexandria) has a 65mph speed limit. Everything else is 55mph or less.

[STLmapboy]

St. Louis County--65 on I-44 near Eureka.

[cl94]

New York is pretty easy to do statewide. This is an exhaustive list.

50: Bronx, Kings, New York, Queens, Richmond
55: Nassau, Suffolk, Wyoming, Orleans, Wayne, Yates, Schuyler, Tompkins, Lewis, St. Lawrence, Franklin, Hamilton, Fulton, Washington
65: All others

[Flint1979]

70 on I-75/US-23 and I-675.

[NWI_Irish96]

It's 70 for all of the following counties in Indiana:
Lake, Porter, LaPorte, St. Joseph, Elkhart, Lagrange, Steuben
Newton, Jasper, White, Tippecanoe, Clinton, Boone, Johnson, Shelby, Bartholomew, Jackson, Scott, Clark
Floyd, Harrison, Crawford, Perry, Spencer, Dubois, Warrick, Gibson, Vanderbugh, Posey
Pike, Daviess, Greene, Monroe, Hamilton, Madison, Delaware, Grant, Huntington, Wells, Allen, DeKalb
Wayne, Henry, Hancock, Marion, Hendricks, Morgan, Putnam, Clay, Vigo
Vermillion, Fountain, Montgomery, Rush, Decatur, Franklin, Ripley, Dearborn

It's 65 for the following counties:
Howard, Marshall

It's 60 for the following counties:
Fulton, Miami, Tipton, Starke, Kosciusko, Whitley
Washington, Miami, Cass, Carroll, Benton, Warren
Sullivan, Knox, Adams

55 in the rest of the counties

[US 89]

For Utah

80: Beaver, Box Elder, Emery, Grand, Iron, Juab, Millard, Sevier, Summit, Tooele, Washington
75: Morgan, Salt Lake, Utah, Weber
70: Davis
65: Everything else, which is every county not on an interstate

[allniter89]

70mph, I-10 Okaloosa Co, FL.

[1995hoo]

65 in the HO/T lanes on I-95, I-395, and I-495; highest in non-HO/T lanes is 60 mph on I-66 west of Centreville. There have been reports the future I-66 HO/T lanes outside the Beltway may get a 70-mph speed limit, but we'll see.

[kphoger]

Sedgwick County, KS

75 mph, on two different roads

[GaryV]

70, on all 4 Interstates and 1 or 2 other freeway state highways.

[Ketchup99]

70, on I-99 south of MM68 (Centre County, PA)

[jmacswimmer]

Here's what I have for Maryland counties (and independent city):

70 — Garrett, Allegany, Washington, Frederick, Carroll, Howard
65 — Montgomery, Prince George's, Anne Arundel, Baltimore, Harford, Cecil, Wicomico
55 — Baltimore City, Charles, St. Mary's, Calvert, Kent, Queen Anne's, Caroline, Talbot, Dorchester, Somerset, Worcester

[renegade]

Too many similar threads spoils the forum.

It's been spoiling for a couple months now.

[riiga]

120 km/h (75 mph) on parts of the E 4 (main motorway through the county).

[Eth]

I'm not attempting this for all of Georgia's counties, but for my own (DeKalb): 70 MPH on I-20 east of about mile marker 70.

Before I looked this up, I suspected DeKalb might be the only Georgia county with an Interstate that didn't reach 70, but seemingly not.

[frankenroad]

Hamilton County, OH - 70 on part of I-74.   All other freeways are 55 or 65.

[CoreySamson]

Brazoria County, TX: 65 mph on SH 288 and SH 35.

[M3100]

Los Angeles County, CA: 70 on CA-14 in the Palmdale area