One-county state highways

[roadman65]

NJ, off the top of my head (so pardon any errors):
5 - Bergen (original 5 followed 46 to Passaic, Essex, Morris)
13 - Ocean
17 - Bergen (multi-state route)
19 - Passaic (originally proposed as 20)
20 - Passaic (also in Bergen until 1988)
26 - Middlesex (followed 1 to Mercer until 1953)
32 - Middlesex
33 Business - Monmouth
36 - Monmouth
37 - Ocean (once proposed as freeway to Mercer)
48 - Salem (followed 40 to Atlantic until 1953)
53 - Morris
59 - Union
62 - Passaic
63 - Bergen
64 - Mercer
66 - Monmouth
67 - Bergen
68 - Burlington
75 (unbuilt) - Essex
I-76 - Camden
79 - Monmouth
82 - Union
83 - Cape May
87 - Atlantic (originally proposed with a bridge to Ocean)
88 - Ocean
91 - Middlesex
93 - Bergen
***
I-278 - Union
284 - Sussex
324 - Gloucester
439 - Union
445X (Brigantine Connector) - Atlantic
446, 446S (Palisades Parkway) - Bergen
495 (already mentioned) - Hudson

*** Most of the 1xx routes are in a single county. In fact, here are the ones in multiple counties: 124, US 130, 158 (former), 159, 167, 168, 173, 181, 183, I-195.

Not to nitpick, but you did forget NJ 12 in Hunterdon. 

[JREwing78]

Highway 30 is the only one I can think of off hand for Wisconsin.

We can also add WI 213.

[Sanctimoniously]

Just in Ouachita Parish, I can think of. . .

LA 594
LA 616
LA 617
LA 837
LA 838
LA 840-1
LA 840-6
LA 841
LA 3033

There are probably even more than that.

[The High Plains Traveler]

Minnesota has quite a few in the Cities area from what I can recall.

At one time (before 1980s) that would have been accurate. With turnbacks of trunk highways that were mostly city streets, there are only a few in the Twin Cities area.
100 (Hennepin)
121 (the short ramp from I-35W to Lyndale at the 62 interchange - Hennepin)
243 (Washington)
244 (Washington)
97 (Washington)
280 (Ramsey)
62 (Hennepin)
110 (Dakota)
252 (Hennepin
51 (Ramsey)
50 (Dakota)

My "only a few" list grew as I actually looked at a map. Outstate you would have the remaining 2xx and 3xx routes that were established to serve state facilities. If I had to guess the longest single-county route in Minnesota I would probably look for a large county by area like St. Louis and speculate it may be MN-169.

[twinsfan87]

Highway 30 is the only one I can think of off hand for Wisconsin.

We can also add WI 213.

There are also WI 243 in Polk County, WI 112 in Ashland County, WI 111 in Price County, WI 79 in Dunn County, WI 124 & WI 178 in Chippewa County, and WI 122 in Iron County... and maybe more, but those are the ones I can think of right now.

Minnesota has quite a few in the Cities area from what I can recall.

At one time (before 1980s) that would have been accurate. With turnbacks of trunk highways that were mostly city streets, there are only a few in the Twin Cities area.
100 (Hennepin)
121 (the short ramp from I-35W to Lyndale at the 62 interchange - Hennepin)
243 (Washington)
244 (Washington)
97 (Washington)
280 (Ramsey)
62 (Hennepin)
110 (Dakota)
252 (Hennepin
51 (Ramsey)
50 (Dakota)

My "only a few" list grew as I actually looked at a map. Outstate you would have the remaining 2xx and 3xx routes that were established to serve state facilities. If I had to guess the longest single-county route in Minnesota I would probably look for a large county by area like St. Louis and speculate it may be MN-169.

Actually MN 169 crosses briefly into Lake County, according to http://www.dot.state.mn.us/maps/cadd/county/lake3.pdf, so I'm not sure what the longest single-county route in MN would be...

[cpzilliacus]

I-97.

D.C. 295 and its northern continuation into Prince George's County, Maryland, Route 201.

[vtk]

These are near me...
OHIO
Delaware:
521, 750
Franklin:
317, 710
33T*, 315C*
(I-270, I-670)
Madison:
142
Pickaway:
316, 752, 762
Union:
736

[kphoger]

I-97.

Since the thread is about State Highways, I'll also include IN-520 and Iowa Highways 100, unsigned 461, 922, 965, and all of the other little spurs that were decommissioned in 2003.

I-238????

[hbelkins]

I wouldn't even attempt this for Kentucky, as most of the four-digit routes and many of the three-digit routes would fit this category.

[vtk]

How many state routes are entirely within Cherry Co, NE?

[TheStranger]

A few more California examples:

Alameda - 112, 262

Los Angeles - 103, 170

Monterey - 218

Sacramento - 51, 244

San Diego - 15, 52, 54, 67, 75, 76, 94, 188, (209), (252), (274), 282, 905

Santa Cruz - 236

[CentralCAroadgeek]

Offhand I can think of a few Texas examples... severely incomplete list follows:

• SH 10 and SH 26 in Tarrant Co.
• SH 57 in Smith Co.
• SH 151 and SH 218 in Bexar Co.
• SH 93 in Bowie Co.
• SH 40 in Brazos Co.
• Toll SH 255 in Webb Co.

Not sure whether most of these are in the more urban areas or if those are just the examples that came to my mind more readily. There are a few in relatively less populated areas, i.e., SH 51 in Hansford Co., but as expected many seem to connect two county seats.

Oh, of course, can't forget SH 165 in Travis Co.

I'd like to add TX-286 and TX-358 in Nueces County to that.

Even More California:
Amador County

• 124

Butte County

• 149
• 191

Del Norte County

• 197

Humboldt County

• 169
• 211
• 254
• 255

Imperial County

• 7
• 98
• 115
• 186

Inyo County

• 136

Kern County

• 119
• 184
• 202
• 223

Lake County

• 53
• 281

Madera County

• 233

Merced County

• 59

Mono County

• 158
• 167
• 182
• 203
• 266

Placer County

• 28
• 174

Riverside County

• 86S
• 177
• 243
• 371

San Bernardino County

• 247

Shasta County

• 273

Siskiyou County

• 161
• 265

Sonoma County

• 116

Tulare County

• 137 (? - because the road atlas shows it slightly crossing the county line)
• 201
• 216

*Whew...*

[cpzilliacus]

Maryland has tons and tons of them.  I'm pretty sure I can come up with at least fifteen or twenty in Montgomery County alone.

Many small state highways in Montgomery County  were decommissioned in the late 1990's in exchange for SHA taking-over what is now Md. 119, the Great Seneca Highway.

Here are some (several "little" ones omitted):

107
109 (comes close to, but apparently does not enter, Frederick County)
112
115
118
119
121
124
182
185
186
187
188
189
190
191
192
195
384
390
396
547
586
614
787
899
911
927

[mjb2002]

South Carolina has plenty of them too. Here are those in my area.

In Aiken County:

SC 118
SC 421 (AUGUSTA RD)

In Barnwell County:

SC 37
SC 304 (HILDA RD)

In Edgefield County:

SC 430 (MEETING STREET RD)

In Hampton County:

SC 363

In Orangeburg County:

SC 210 (BOWMAN BRANCH HY)
SC 310 (CAMDEN RD)
SC 314 (BUNCHES FORD RD)

In Saluda County:

SC 193
SC 194

[deathtopumpkins]

Essex County, Massachusetts:
22
35
97
108
114
127
127A
129A
213
286

[Brandon]

Illinois (from north to south):

Jo Davies County:
IL-35

Winnebago County:
IL-70

Boone County:
IL-76

Lake County:
IL-131
IL-132
IL-134
IL-137

Cook County:
I-190

Will County:
IL-129

La Salle County:
IL-178
IL-351

Whiteside County:
IL-136

Henry County:
IL-81

Rock Island County:
IL-5
IL-192

Warren County:
IL-135*
*IL-135 forms part of the line between Mercer and Warren Counties

Knox County:
IL-167
IL-180

Stark County:
IL-93

Peoria County:
IL-6
IL-90

Kankakee County:
IL-114

Tazewell County:
IL-98

Adams County:
IL-57

Pike County:
US-54

Sangamon County:
IL-124

Vermilion County:
IL-119

Macoupin County:
IL-138

Jersey County:
IL-109

Madison County:
I-270
IL-143
IL-255

St Clair County:
IL-163

White County:
IL-141*
*IL-141 forms part of the line between Gallatin and White Counties

Franklin County:
IL-184

Perry County:
IL-152

Randolph County:
IL-155

Jackson County:
IL-151

Alexander County:
US-60
US-62

In addition, there are more than a that just barely cross a county line after spending most of their time in one county such as IL-58 (Cook County with a few blocks in Kane County).

[NE2]

FL 437  Orange(now defunct)

Have the signs been removed? They were still there in 2011:

FL 438 Orange (used to enter Lake County, now truncated to Oakland)

I don't think it ever entered Lake County.

[Ian]

Delaware County, PA
-PA 420
-PA 452
-PA 261
-PA 491

Chester County, PA (I'm sure I've missed a few)
-PA 926
-PA 796
-PA 841
-PA 842
-PA 82
-PA 282
-PA 52
-PA 162

New Castle, Kent, and Sussex County, Delaware
-a lot

[roadman65]

New Castle, Kent, and Sussex County, Delaware
-a lot

Of course being those are the only three counties of the State and all go across it completely.  Therefore all East to West highways cannot be intercounty.

[NE2]

New Castle, Kent, and Sussex County, Delaware
-a lot

Of course being those are the only three counties of the State and all go across it completely.  Therefore all East to West highways cannot be intercounty.

Except for SR 16 and formerly SR 14.

[iowahighways]

Iowa (not counting highways that cross into other states):
32: Dubuque
51: Allamakee
58: Black Hawk
62: Jackson
85: Poweshiek
98: Van Buren
100: Linn
117: Jasper
122: Cerro Gordo
127: Harrison
128: Clayton
152: Clarke
160: Polk
165: Pottawattamie
182: Lyon
192: Pottawattamie
196: Sac
212: Iowa
220: Iowa
224: Jasper
333: Fremont
346: Chickasaw
415: Polk

Honorable mention: Southbound IA 23 is entirely in Mahaska County, but part of northbound IA 23 is in Keokuk County since its southernmost two miles straddle the county line.

[mgk920]

Highway 30 is the only one I can think of off hand for Wisconsin. Minnesota has quite a few in the Cities area from what I can recall.

Both WI 15 and WI 125 are entirely in Outagamie County.

Also, WI 119, WI 241 and WI 341 are entirely in Milwaukee County.

WI 105 is entirely in Douglas County.

WI 172 is entirely in Brown County.

These are just a few.

--------------

One that Big John missed - WI 180 is entirely in Marinette County.

I was thinking that WI 110 was entirely in Waupaca County, but then I remembered that its northernmost couple of blocks are in Shawano County.

Mike

[Alps]

Not to nitpick, but you did forget NJ 12 in Hunterdon. 

(so pardon any errors):

[DandyDan]

How many state routes are entirely within Cherry Co, NE?

Being it is mostly ranch land in Cherry County, the only state highways which exist solely in Cherry County are S-16A, S-16B, and S-16F.

As for Nebraska in general, most of the spurs and links are in one county.  As for numbered highways, the only ones I can think of offhand are  1 (Cass County), 110 (Dakota County) and 370 (Sarpy County).  Some of the highways split into multiple parts have parts entirely in one county (the far eastern part of 66 is entirely in Cass County), but the highway as a whole is not.

[barcncpt44]

Lots of these in Alabama:

Baldwin County:
AL-180
AL-182
AL-135
AL-161
AL-104
AL-181
AL-287
AL-225

Mobile County:
I-165
AL-188
AL-193
AL-217
AL-158
AL-163
AL-213

Jackson County:
AL-146
AL-277
AL-279
AL-71
AL-73

Madison County:
AL-255

Limestone County:
AL-251
AL-127

Lauderdale County:
AL-64
AL-207

Marshall County:
AL-62 (4-lane in the middle of nowhere)

Dekalb County:
AL-176

Cherokee County:
AL-273
AL-283

Etowah County:
AL-291
AL-759/I-759
AL-211

Cleburne County:
AL-46

Calhoun County:
AL-204
AL-200
AL-202 (Ends at I-20/Talladega County line)

Talladega County:
AL-275 (about to be taken out when bypass is complete)
AL-235

St. Clair County
AL-174
AL-23

Blount County:
AL-160

Cullman County:
AL-91

Marion County:
AL-233
AL-44
AL-253
AL-142

Walker County:
AL-257 (ends at county line)
AL-124

Jefferson County:
I-459
AL-150
AL-149
AL-151

Shelby County:
AL-70
AL-261

Tuscaloosa County:
I-359
AL-216
AL-297 (future)
AL-215

Pickens County:
AL-86
AL-32

Bibb County:
AL-58
AL-209

Sumter County:
AL-116

Hale County:
AL-60

Perry County:
AL-175
AL-289

Chilton County:
AL-191

Coosa County:
AL-115

Tallapoosa County:
AL-128
AL-121 (recently taken out)
AL-120 (ends at AL-14/also county line)

Lee County:
AL-267

Russell County:
AL-208
AL-26

Macon County:
AL-81
AL-199
AL-138
AL-186

Elmore County:
AL-170
AL-212

Montgomery County:
AL-293
AL-126
AL-108 (Future I-85 loop)
AL-271
AL-152
AL-94

Dallas County:
AL-140

Wilcox County:
AL-164
AL-221
AL-162

Choctaw County:
AL-156

Clarke County:
AL-154
AL-295
AL-178
AL-177

Monroe County:
AL-83 (county line in middle of road at AL-47)
AL-136

Butler County:
AL-245

Washington County:
AL-56

Bullock County:
AL-197

Barbour County:
AL-198
AL-30
AL-131
AL-285

Pike County:
AL-201
AL-93

Henry County:
AL-173

Dale County:
AL-249
AL-37

Coffee County:
AL-192
AL-88
AL-203
AL-166
AL-122

Covington County:
AL-100
AL-55
AL-137

Escambia County:
AL-113

Geneva County:
AL-196
AL-153

Houston County:
AL-109
AL-210