Highest speed limit in your county?

[jakeroot]

Pierce County, WA (directly south of Seattle).

60 mph; all the freeways. No rural freeways that could take advantage of 70 or 75, and the rural state highways either top out at 55, maybe one spot of 60 that I can't think of.

[webny99]

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

Notably, NY 17 is entirely 55 mph in Delaware County, so it's only on the 65 list because of I-88.

[Revive 755]

For the Illinois portion of Chicagoland, DuPage may be the only county without a 70 mph section - can't tell for sure if the 70 mph portion of I-355 makes it over the border.  Cook, Kane, and McHenry have the 70 mph section of I-90, and Lake County has a 70 mph section on the Tri-State.

[michravera]

70 MPH on CA 99 and I-5.

Likewise 70MPH on a VERY short section of I-580 (somewhere between a few meters and a mile) in Alameda county. It may only be north{west} bound. Otherwise 65MPH.

[cl94]

Notably, NY 17 is entirely 55 mph in Delaware County, so it's only on the 65 list because of I-88.

False. Westernmost few miles is 65. Drops to 55 east of NY 8/10.

[Brandon]

For the Illinois portion of Chicagoland, DuPage may be the only county without a 70 mph section - can't tell for sure if the 70 mph portion of I-355 makes it over the border.  Cook, Kane, and McHenry have the 70 mph section of I-90, and Lake County has a 70 mph section on the Tri-State.

That 70mph section of I-355 ends at I-55.  It does not make it into DuPage County.

Will County has I-355, a part of I-55, a part of I-80, and I-57.  Kane County also has a part of I-88 west of IL-47.

[webny99]

Notably, NY 17 is entirely 55 mph in Delaware County, so it's only on the 65 list because of I-88.

False. Westernmost few miles is 65. Drops to 55 east of NY 8/10.

Yeah, and the Delaware County line runs right through Deposit, near the NY 8/10 junction. Just double-checked, and there are no 65 mph signs in either direction within Delaware County.

[stevashe]

Pierce County, WA (directly south of Seattle).

60 mph; all the freeways. No rural freeways that could take advantage of 70 or 75, and the rural state highways either top out at 55, maybe one spot of 60 that I can't think of.

I believe you are correct.

For King County, it's I-90 from east of Issaquah to Exit 47 with 70 mph.

[jakeroot]

Pierce County, WA (directly south of Seattle).

60 mph; all the freeways. No rural freeways that could take advantage of 70 or 75, and the rural state highways either top out at 55, maybe one spot of 60 that I can't think of.

I believe you are correct.

For King County, it's I-90 from east of Issaquah to Exit 47 with 70 mph.

I'm thinking Pierce County might be the only one with an interstate that does not have a 70 section? Snohomish County is in the clear, as is Thurston and Clark.

[Konza]

75 MPH on I-10 in Cochise County, Arizona.

[WillWeaverRVA]

Chesterfield County, VA: 65 on VA 288. For surface roads, a segment of US 360 is signed at 60.

[MikieTimT]

Very shortly to change to 75mph south of Fayetteville on I-49

[Roadgeekteen]

In Massachusetts, I think that every county has 65 except for Suffolk (55), Barnstable (55, unless MA 25 makes it into the county), and the two island counties.

[Ketchup99]

If I'm gonna do PA:

70: Erie, Crawford, Mercer, Lawrence, Butler, Beaver, Allegheny, Washington, Greene, Fayette, Westmoreland, Somerset, Bedford, Blair, Huntingdon, Fulton, Franklin, Cumberland, York, Dauphin, Lebanon, Lancaster, Berks, Chester, Montgomery, Bucks, Lehigh, Carbon, Luzerne, Lackawanna, Monroe, Columbia, Montour, Northumberland, Union, Clinton, Lycoming, Tioga, Centre, Clearfield, Jefferson, Clarion, Vengano (43)

65: Wayne, Pike, Northampton, Schuylkill, Adams, Mifflin, Juniata, Perry, Cambria, Indiana, Armstrong (11)

55: Warren, Forest, Elk, McKean, Potter, Cameron, Bradford, Sullivan, Wyoming, Susquehanna, Snyder, Delaware, Philadelphia (13)

[deathtopumpkins]

In Massachusetts, I think that every county has 65 except for Suffolk (55), Barnstable (55, unless MA 25 makes it into the county), and the two island counties.

MA 25 does indeed make it into Barnstable county, and is posted 65.

[ftballfan]

For Michigan:

75: Arenac, Bay, Cheboygan, Chippewa, Clare, Clinton, Crawford, Emmet, Genesee, Gratiot, Isabella, Kent, Lapeer, Mackinac, Mason, Mecosta, Midland, Montcalm, Oceana, Ogemaw, Osceola, Otsego, Roscommon, Shiawassee, St. Clair, Wexford [26 counties]
70: Allegan, Berrien, Branch, Calhoun, Eaton, Ingham, Ionia, Jackson, Kalamazoo, Livingston, Macomb, Monroe, Muskegon (US-31 drops from 75 at the county line), Oakland, Ottawa, Saginaw, Van Buren, Washtenaw, Wayne [19 counties]
65: Alcona, Alger, Alpena, Baraga, Benzie, Delta, Gogebic, Houghton, Iosco, Iron, Lake, Luce, Manistee, Marquette, Montmorency, Ontonagon, Oscoda, Presque Isle, Schoolcraft [19 counties]
55: Antrim, Barry, Cass, Charlevoix, Dickinson, Gladwin, Grand Traverse, Hillsdale, Huron, Kalkaska, Keweenaw, Leelanau, Lenawee, Menominee, Missuakee, Newaygo, Sanilac, St. Joseph, Tuscola [19 counties]

[Road Hog]

In Collin County and other metro counties in DFW, speed limits were capped at 65 mph because of EPA smog compliance regs. That has been relaxed in recent years where speed limits were raised to 70 on certain freeways and tollways. US 75 and the DNT are the only roads with a 70 limit in this county.

[kylebnjmnross]

For Cumberland County, PA, I believe it's the 70 MPH speed limit on the Turnpike.

[kphoger]

For Cumberland County, PA, I believe it's the 70 MPH speed limit on the Turnpike.

Well, that would be a safe bet, considering 75 mph doesn't exist in PA.

[Ketchup99]

In Massachusetts, I think that every county has 65 except for Suffolk (55), Barnstable (55, unless MA 25 makes it into the county), and the two island counties.

MA 25 does indeed make it into Barnstable county, and is posted 65.

No it doesn't... does it? I think it ends on the west side of the canal.

[Tarkus]

For Washington County, Oregon, it's 65mph--but only for about 2 miles of I-5, between the I-205 interchange and the Clackamas County line partway into Wilsonville, and about a half-mile (if that) of I-205, before it also crosses into Clackamas County at the SW 65th Ave overpass.

For the whole state:

55 - Benton, Clatsop, Columbia, Coos, Curry, Lincoln, Polk, Tillamook, Wallowa, Wheeler, Yamhill
65 - Clackamas, Crook, Deschutes, Douglas, Grant, Harney, Hood River, Jackson, Jefferson, Josephine, Klamath, Lake, Lane, Linn, Marion, Multnomah, Washington
70 - Baker, Gilliam, Malheur, Morrow, Sherman, Umatilla, Union, Wasco

The 55s are pretty much the coastal counties, ones adjacent to the coastal counties that don't quite reach out to I-5, and then the two oddballs of Wallowa and Wheeler (which, while in the eastern part of the state, are mountainous and away from the interstates).  All three counties in the Portland metro area get to 65, due to the interstates at their outer bounds (Clackamas and Washington just barely, but Multnomah has a decent stretch of I-84 that's at 65).  The 70s are all due to I-84 and US-95.  Prior to 2016, with the passage of HB4047 (which finally forced ODOT to raise some speeds in Central/Eastern Oregon), the list of 55s was a LOT longer, and there were no 70s.

[hotdogPi]

In Massachusetts, I think that every county has 65 except for Suffolk (55), Barnstable (55, unless MA 25 makes it into the county), and the two island counties.

MA 25 does indeed make it into Barnstable county, and is posted 65.

No it doesn't... does it? I think it ends on the west side of the canal.

The county line is not the canal. MA 25 is on the west side of the canal, but it does cross the county line.

[Roadgeekteen]

In Massachusetts, I think that every county has 65 except for Suffolk (55), Barnstable (55, unless MA 25 makes it into the county), and the two island counties.

MA 25 does indeed make it into Barnstable county, and is posted 65.

No it doesn't... does it? I think it ends on the west side of the canal.

The county line is not the canal. MA 25 is on the west side of the canal, but it does cross the county line.

The town of Bourne extends past the canal right?

[Ned Weasel]

Johnson County, KS:

75 MPH on US 69 south of 199th Street and on I-35 south of Sunflower Road, although the second one is very close to the Miami County line.

[jp the roadgeek]

Hartford County, CT:

65: All portions of I-291, I-384, I-691, and CT 9.   I-84 west of CT 9 except through the CT 72 concurrency; also east of CT 15.  I-91 south of CT 3 and from just south of I-291 to the MA border.  CT 2 east of CT 94. CT 20 Bradley Connector.

New Haven County: I-84 except through Waterbury.   I-91 north of Exit 8 except between Exits 16-18. I-95 from Branford east.  I-691.

Every county in CT has at least 1 65 zone.  Litchfield and Fairfield have 1 each (CT 8 north of CT 262, and I-84 east of Exit 8).  Tolland and Windham each have 3 thanks to the US 6 Willimantic Bypass meandering between the two counties; Tolland also has I-84 and I-384, Windham also has I-395.  Middlesex has 4 (I-91, I-95, and two sections of CT 9).  New London has 5 (2 sections of I-95, I-395, CT 2 west of Norwich, and CT 11).