Wikipedia:WikiProject U.S. Roads/Wyoming/numbering history

A 1963 Gousha map shows four-digit "state secondary" numbers. There is an obvious pattern in comparing old to new numbers. They also match the numbers in the Reference Marker Book.

Albany County

 * WYO 10: 0101
 * WYO 11: 0102
 * WYO 130: 0103
 * WYO 12: 0104
 * WYO 13: 0105
 * WYO 210: 0107
 * WYO 34: 0109
 * WYO 14: 0103 Spur (now 0110)

Big Horn County

 * WYO 30: 0200
 * WYO 31: 0201; 0201 Spur (now 0203) is a wye connection at Manderson
 * WYO 32: 0202
 * WYO 33: 0205 ("new name" only)
 * WYO 35: 0206 ("new name" only)
 * WYO 36: 0207 ("new name" only)
 * WYO 37: 0208

Campbell County

 * WYO 50: 0300
 * WYO 59: 0301 (now 43)
 * US 14/US 16: 0302
 * WYO 51: 0303

Carbon County

 * WYO 70: 0401
 * WYO 71: 0402
 * WYO 72: 0404, 0412
 * WYO 73: 0406
 * WYO 74
 * WYO 75
 * WYO 76: 0411
 * WYO 77
 * WYO 78

Converse County

 * WYO 90
 * WYO 91
 * WYO 93: 0502
 * WYO 94
 * WYO 95: 0504
 * US 20/US 26/US 87: 0505
 * WYO 96

Crook County

 * WYO 116: 0600
 * WYO 24: 0601
 * WYO 110: 0601 Spur (now 0602)
 * WYO 111: 0603
 * WYO 112: 0604
 * WYO 113
 * US 14: 0607

Fremont County

 * WYO 131: 0701
 * WYO 132: 0703
 * WYO 133: 0706
 * WYO 134: 0707
 * WYO 135: 0708
 * WYO 136: 0710
 * WYO 137: 0711
 * WYO 138
 * WYO 139: 0708 Spur (now 0709)

Goshen County

 * WYO 151: 0800
 * WYO 152: 0801
 * WYO 153
 * WYO 154: 0803
 * WYO 155
 * WYO 156: 0805
 * WYO 157: 0806
 * WYO 92: 0807
 * WYO 158: 0807 Spur (now 0802)
 * WYO 159: 0808
 * WYO 160: 0809
 * WYO 161: 0811

Hot Springs County

 * WYO 170: 0900
 * WYO 171: 0901
 * WYO 172: 0902
 * WYO 173: 0903
 * WYO 174
 * WYO 175: 0904
 * WYO 176
 * WYO 177?

Johnson County

 * WYO 190: 1000
 * WYO 191: 1001 (now 1000)
 * WYO 192: 1002
 * WYO 193: 1003
 * WYO 194: 1003 Spur (now 1702)
 * US 16: 1004
 * WYO 195
 * WYO 196: 1006
 * WYO 197

Laramie County

 * WYO 210
 * WYO 211: 1100
 * WYO 212
 * WYO 213: 1102
 * WYO 214: 1103
 * WYO 215: 1104
 * WYO 216: 1105
 * WYO 217
 * WYO 218
 * WYO 219: 1108
 * WYO 221
 * WYO 222
 * US 30: 1111
 * WYO 223
 * WYO 224
 * WYO 225
 * WYO 226

Lincoln County

 * WYO 231: 1200
 * WYO 232: 1201
 * WYO 233: 1202
 * WYO 234
 * WYO 235: 1203
 * WYO 236: 1204
 * WYO 237: 1205
 * WYO 238: 1206
 * WYO 239: 1207
 * WYO 240: 1208
 * WYO 241: 1209
 * US 30: 1210 ("new name" only)
 * WYO 89: 1211 ("new name" only)

Natrona County

 * WYO 250
 * WYO 251: 1301
 * WYO 252: 1301 Spur (now 1302)
 * WYO 253
 * WYO 254
 * WYO 255
 * WYO 256
 * WYO 257
 * WYO 258
 * WYO 259

Niobrara County

 * WYO 270: 1400, 1401
 * WYO 271
 * WYO 272
 * WYO 273
 * WYO 274

Park County

 * WYO 290: 1500
 * WYO 291: 1501
 * WYO 292
 * WYO 293
 * WYO 294: 1503
 * WYO 295: 1504, 1505 (now also 1506)
 * WYO 296: 1507
 * WYO 297

Platte County

 * WYO 310: 1600
 * WYO 311: 1600 (now 1601)
 * WYO 312: 1601
 * WYO 313: 1602
 * WYO 314: 1603
 * WYO 315: 1605
 * WYO 316: 1604
 * WYO 317
 * WYO 318
 * WYO 319
 * WYO 320: 1610
 * WYO 321
 * WYO 322

Sheridan County

 * WYO 331: 1701
 * WYO 332: 1702
 * WYO 333
 * WYO 334
 * WYO 335: 1703
 * WYO 336: 1704
 * WYO 337
 * WYO 338: 1706
 * WYO 339: 1706 Spur (now 1705)
 * WYO 340: 1707
 * WYO 341: 1700 ("new name" only)
 * WYO 342
 * WYO 343: 1709
 * WYO 344
 * WYO 345: 1712

Sublette County

 * WYO 350: 1800
 * WYO 351: 1801
 * WYO 352: 1802
 * WYO 353: 1804
 * WYO 354

Sweetwater County

 * WYO 530: 1900
 * WYO 430: 1903
 * WYO 370: 1904
 * WYO 371: 1905
 * WYO 372: 1906
 * WYO 373
 * WYO 374: 1910
 * WYO 375: 1909
 * WYO 376
 * WYO 377: 1911
 * WYO 28: 1912

Teton County

 * WYO 22: 2000
 * WYO 390: 2001
 * WYO 391

Uinta County

 * WYO 150: 2100
 * WYO 410: 2101
 * WYO 411: 2104 ("new name" only)
 * WYO 412: 2103
 * WYO 413
 * WYO 414: 2105

Washakie County

 * WYO 431: 2200
 * WYO 432: 2201
 * WYO 433: 2202
 * WYO 434: 2203
 * WYO 435
 * WYO 436

Weston County

 * WYO 450: 2300
 * WYO 451: 2301
 * WYO 116: 2302
 * WYO 585: 2303
 * WYO 452