A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 1281, GLENWOOD SPRINGS, CO 81602-1281
PO BOX 1282, GLENWOOD SPRINGS, CO 81602-1282
PO BOX 1283, GLENWOOD SPRINGS, CO 81602-1283
PO BOX 1284, GLENWOOD SPRINGS, CO 81602-1284
PO BOX 1285, GLENWOOD SPRINGS, CO 81602-1285
PO BOX 1286, GLENWOOD SPRINGS, CO 81602-1286
PO BOX 1287, GLENWOOD SPRINGS, CO 81602-1287
PO BOX 1288, GLENWOOD SPRINGS, CO 81602-1288
PO BOX 1289, GLENWOOD SPRINGS, CO 81602-1289
PO BOX 1290, GLENWOOD SPRINGS, CO 81602-1290
PO BOX 1291, GLENWOOD SPRINGS, CO 81602-1291
PO BOX 1292, GLENWOOD SPRINGS, CO 81602-1292
PO BOX 1293, GLENWOOD SPRINGS, CO 81602-1293
PO BOX 1294, GLENWOOD SPRINGS, CO 81602-1294
PO BOX 1295, GLENWOOD SPRINGS, CO 81602-1295
PO BOX 1296, GLENWOOD SPRINGS, CO 81602-1296
PO BOX 1297, GLENWOOD SPRINGS, CO 81602-1297
PO BOX 1298, GLENWOOD SPRINGS, CO 81602-1298
PO BOX 1299, GLENWOOD SPRINGS, CO 81602-1299
PO BOX 1300, GLENWOOD SPRINGS, CO 81602-1300
PO BOX 1301, GLENWOOD SPRINGS, CO 81602-1301
PO BOX 1302, GLENWOOD SPRINGS, CO 81602-1302
PO BOX 1303, GLENWOOD SPRINGS, CO 81602-1303
PO BOX 1304, GLENWOOD SPRINGS, CO 81602-1304
PO BOX 1305, GLENWOOD SPRINGS, CO 81602-1305
PO BOX 1306, GLENWOOD SPRINGS, CO 81602-1306
PO BOX 1307, GLENWOOD SPRINGS, CO 81602-1307
PO BOX 1308, GLENWOOD SPRINGS, CO 81602-1308
PO BOX 1309, GLENWOOD SPRINGS, CO 81602-1309
PO BOX 1310, GLENWOOD SPRINGS, CO 81602-1310
PO BOX 1311, GLENWOOD SPRINGS, CO 81602-1311
PO BOX 1312, GLENWOOD SPRINGS, CO 81602-1312
PO BOX 1313, GLENWOOD SPRINGS, CO 81602-1313
PO BOX 1314, GLENWOOD SPRINGS, CO 81602-1314
PO BOX 1315, GLENWOOD SPRINGS, CO 81602-1315
PO BOX 1316, GLENWOOD SPRINGS, CO 81602-1316
PO BOX 1317, GLENWOOD SPRINGS, CO 81602-1317
PO BOX 1318, GLENWOOD SPRINGS, CO 81602-1318
PO BOX 1319, GLENWOOD SPRINGS, CO 81602-1319
PO BOX 1320, GLENWOOD SPRINGS, CO 81602-1320
PO BOX 1321, GLENWOOD SPRINGS, CO 81602-1321
PO BOX 1322, GLENWOOD SPRINGS, CO 81602-1322
PO BOX 1323, GLENWOOD SPRINGS, CO 81602-1323
PO BOX 1324, GLENWOOD SPRINGS, CO 81602-1324
PO BOX 1325, GLENWOOD SPRINGS, CO 81602-1325
PO BOX 1326, GLENWOOD SPRINGS, CO 81602-1326
PO BOX 1327, GLENWOOD SPRINGS, CO 81602-1327
PO BOX 1328, GLENWOOD SPRINGS, CO 81602-1328
PO BOX 1329, GLENWOOD SPRINGS, CO 81602-1329
PO BOX 1330, GLENWOOD SPRINGS, CO 81602-1330
PO BOX 1331, GLENWOOD SPRINGS, CO 81602-1331
PO BOX 1332, GLENWOOD SPRINGS, CO 81602-1332
PO BOX 1333, GLENWOOD SPRINGS, CO 81602-1333
PO BOX 1334, GLENWOOD SPRINGS, CO 81602-1334
PO BOX 1335, GLENWOOD SPRINGS, CO 81602-1335
PO BOX 1336, GLENWOOD SPRINGS, CO 81602-1336
PO BOX 1337, GLENWOOD SPRINGS, CO 81602-1337
PO BOX 1338, GLENWOOD SPRINGS, CO 81602-1338
PO BOX 1339, GLENWOOD SPRINGS, CO 81602-1339
PO BOX 1340, GLENWOOD SPRINGS, CO 81602-1340
PO BOX 1341, GLENWOOD SPRINGS, CO 81602-1341
PO BOX 1342, GLENWOOD SPRINGS, CO 81602-1342
PO BOX 1343, GLENWOOD SPRINGS, CO 81602-1343
PO BOX 1344, GLENWOOD SPRINGS, CO 81602-1344
PO BOX 1345, GLENWOOD SPRINGS, CO 81602-1345
PO BOX 1346, GLENWOOD SPRINGS, CO 81602-1346
PO BOX 1347, GLENWOOD SPRINGS, CO 81602-1347
PO BOX 1348, GLENWOOD SPRINGS, CO 81602-1348
PO BOX 1349, GLENWOOD SPRINGS, CO 81602-1349
PO BOX 1350, GLENWOOD SPRINGS, CO 81602-1350
PO BOX 1351, GLENWOOD SPRINGS, CO 81602-1351
PO BOX 1352, GLENWOOD SPRINGS, CO 81602-1352
PO BOX 1353, GLENWOOD SPRINGS, CO 81602-1353
PO BOX 1354, GLENWOOD SPRINGS, CO 81602-1354
PO BOX 1355, GLENWOOD SPRINGS, CO 81602-1355
PO BOX 1356, GLENWOOD SPRINGS, CO 81602-1356
PO BOX 1357, GLENWOOD SPRINGS, CO 81602-1357
PO BOX 1358, GLENWOOD SPRINGS, CO 81602-1358
PO BOX 1359, GLENWOOD SPRINGS, CO 81602-1359
PO BOX 1360, GLENWOOD SPRINGS, CO 81602-1360
PO BOX 1361, GLENWOOD SPRINGS, CO 81602-1361
PO BOX 1362, GLENWOOD SPRINGS, CO 81602-1362
PO BOX 1363, GLENWOOD SPRINGS, CO 81602-1363
PO BOX 1364, GLENWOOD SPRINGS, CO 81602-1364
PO BOX 1365, GLENWOOD SPRINGS, CO 81602-1365
PO BOX 1366, GLENWOOD SPRINGS, CO 81602-1366
PO BOX 1367, GLENWOOD SPRINGS, CO 81602-1367
PO BOX 1368, GLENWOOD SPRINGS, CO 81602-1368
PO BOX 1369, GLENWOOD SPRINGS, CO 81602-1369
PO BOX 1370, GLENWOOD SPRINGS, CO 81602-1370
PO BOX 1371, GLENWOOD SPRINGS, CO 81602-1371
PO BOX 1372, GLENWOOD SPRINGS, CO 81602-1372
PO BOX 1373, GLENWOOD SPRINGS, CO 81602-1373
PO BOX 1374, GLENWOOD SPRINGS, CO 81602-1374
PO BOX 1375, GLENWOOD SPRINGS, CO 81602-1375
PO BOX 1376, GLENWOOD SPRINGS, CO 81602-1376
PO BOX 1377, GLENWOOD SPRINGS, CO 81602-1377
PO BOX 1378, GLENWOOD SPRINGS, CO 81602-1378
PO BOX 1379, GLENWOOD SPRINGS, CO 81602-1379
PO BOX 1380, GLENWOOD SPRINGS, CO 81602-1380
PO BOX 1381, GLENWOOD SPRINGS, CO 81602-1381
PO BOX 1382, GLENWOOD SPRINGS, CO 81602-1382
PO BOX 1383, GLENWOOD SPRINGS, CO 81602-1383
PO BOX 1384, GLENWOOD SPRINGS, CO 81602-1384
PO BOX 1385, GLENWOOD SPRINGS, CO 81602-1385
PO BOX 1386, GLENWOOD SPRINGS, CO 81602-1386
PO BOX 1387, GLENWOOD SPRINGS, CO 81602-1387
PO BOX 1388, GLENWOOD SPRINGS, CO 81602-1388
PO BOX 1389, GLENWOOD SPRINGS, CO 81602-1389
PO BOX 1390, GLENWOOD SPRINGS, CO 81602-1390
PO BOX 1391, GLENWOOD SPRINGS, CO 81602-1391
PO BOX 1392, GLENWOOD SPRINGS, CO 81602-1392
PO BOX 1393, GLENWOOD SPRINGS, CO 81602-1393
PO BOX 1394, GLENWOOD SPRINGS, CO 81602-1394
PO BOX 1395, GLENWOOD SPRINGS, CO 81602-1395
PO BOX 1396, GLENWOOD SPRINGS, CO 81602-1396
PO BOX 1397, GLENWOOD SPRINGS, CO 81602-1397
PO BOX 1398, GLENWOOD SPRINGS, CO 81602-1398
PO BOX 1399, GLENWOOD SPRINGS, CO 81602-1399
PO BOX 1400, GLENWOOD SPRINGS, CO 81602-1400
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