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 1401, GLENWOOD SPRINGS, CO 81602-1401
PO BOX 1402, GLENWOOD SPRINGS, CO 81602-1402
PO BOX 1403, GLENWOOD SPRINGS, CO 81602-1403
PO BOX 1404, GLENWOOD SPRINGS, CO 81602-1404
PO BOX 1405, GLENWOOD SPRINGS, CO 81602-1405
PO BOX 1406, GLENWOOD SPRINGS, CO 81602-1406
PO BOX 1407, GLENWOOD SPRINGS, CO 81602-1407
PO BOX 1408, GLENWOOD SPRINGS, CO 81602-1408
PO BOX 1409, GLENWOOD SPRINGS, CO 81602-1409
PO BOX 1410, GLENWOOD SPRINGS, CO 81602-1410
PO BOX 1411, GLENWOOD SPRINGS, CO 81602-1411
PO BOX 1412, GLENWOOD SPRINGS, CO 81602-1412
PO BOX 1413, GLENWOOD SPRINGS, CO 81602-1413
PO BOX 1414, GLENWOOD SPRINGS, CO 81602-1414
PO BOX 1415, GLENWOOD SPRINGS, CO 81602-1415
PO BOX 1416, GLENWOOD SPRINGS, CO 81602-1416
PO BOX 1417, GLENWOOD SPRINGS, CO 81602-1417
PO BOX 1418, GLENWOOD SPRINGS, CO 81602-1418
PO BOX 1419, GLENWOOD SPRINGS, CO 81602-1419
PO BOX 1420, GLENWOOD SPRINGS, CO 81602-1420
PO BOX 1421, GLENWOOD SPRINGS, CO 81602-1421
PO BOX 1422, GLENWOOD SPRINGS, CO 81602-1422
PO BOX 1423, GLENWOOD SPRINGS, CO 81602-1423
PO BOX 1424, GLENWOOD SPRINGS, CO 81602-1424
PO BOX 1425, GLENWOOD SPRINGS, CO 81602-1425
PO BOX 1426, GLENWOOD SPRINGS, CO 81602-1426
PO BOX 1427, GLENWOOD SPRINGS, CO 81602-1427
PO BOX 1428, GLENWOOD SPRINGS, CO 81602-1428
PO BOX 1429, GLENWOOD SPRINGS, CO 81602-1429
PO BOX 1430, GLENWOOD SPRINGS, CO 81602-1430
PO BOX 1431, GLENWOOD SPRINGS, CO 81602-1431
PO BOX 1432, GLENWOOD SPRINGS, CO 81602-1432
PO BOX 1433, GLENWOOD SPRINGS, CO 81602-1433
PO BOX 1434, GLENWOOD SPRINGS, CO 81602-1434
PO BOX 1435, GLENWOOD SPRINGS, CO 81602-1435
PO BOX 1436, GLENWOOD SPRINGS, CO 81602-1436
PO BOX 1437, GLENWOOD SPRINGS, CO 81602-1437
PO BOX 1438, GLENWOOD SPRINGS, CO 81602-1438
PO BOX 1439, GLENWOOD SPRINGS, CO 81602-1439
PO BOX 1440, GLENWOOD SPRINGS, CO 81602-1440
PO BOX 1441, GLENWOOD SPRINGS, CO 81602-1441
PO BOX 1442, GLENWOOD SPRINGS, CO 81602-1442
PO BOX 1443, GLENWOOD SPRINGS, CO 81602-1443
PO BOX 1444, GLENWOOD SPRINGS, CO 81602-1444
PO BOX 1445, GLENWOOD SPRINGS, CO 81602-1445
PO BOX 1446, GLENWOOD SPRINGS, CO 81602-1446
PO BOX 1447, GLENWOOD SPRINGS, CO 81602-1447
PO BOX 1448, GLENWOOD SPRINGS, CO 81602-1448
PO BOX 1449, GLENWOOD SPRINGS, CO 81602-1449
PO BOX 1450, GLENWOOD SPRINGS, CO 81602-1450
PO BOX 1451, GLENWOOD SPRINGS, CO 81602-1451
PO BOX 1452, GLENWOOD SPRINGS, CO 81602-1452
PO BOX 1453, GLENWOOD SPRINGS, CO 81602-1453
PO BOX 1454, GLENWOOD SPRINGS, CO 81602-1454
PO BOX 1455, GLENWOOD SPRINGS, CO 81602-1455
PO BOX 1456, GLENWOOD SPRINGS, CO 81602-1456
PO BOX 1457, GLENWOOD SPRINGS, CO 81602-1457
PO BOX 1458, GLENWOOD SPRINGS, CO 81602-1458
PO BOX 1459, GLENWOOD SPRINGS, CO 81602-1459
PO BOX 1460, GLENWOOD SPRINGS, CO 81602-1460
PO BOX 1461, GLENWOOD SPRINGS, CO 81602-1461
PO BOX 1462, GLENWOOD SPRINGS, CO 81602-1462
PO BOX 1463, GLENWOOD SPRINGS, CO 81602-1463
PO BOX 1464, GLENWOOD SPRINGS, CO 81602-1464
PO BOX 1465, GLENWOOD SPRINGS, CO 81602-1465
PO BOX 1466, GLENWOOD SPRINGS, CO 81602-1466
PO BOX 1467, GLENWOOD SPRINGS, CO 81602-1467
PO BOX 1468, GLENWOOD SPRINGS, CO 81602-1468
PO BOX 1469, GLENWOOD SPRINGS, CO 81602-1469
PO BOX 1470, GLENWOOD SPRINGS, CO 81602-1470
PO BOX 1471, GLENWOOD SPRINGS, CO 81602-1471
PO BOX 1472, GLENWOOD SPRINGS, CO 81602-1472
PO BOX 1473, GLENWOOD SPRINGS, CO 81602-1473
PO BOX 1474, GLENWOOD SPRINGS, CO 81602-1474
PO BOX 1475, GLENWOOD SPRINGS, CO 81602-1475
PO BOX 1476, GLENWOOD SPRINGS, CO 81602-1476
PO BOX 1477, GLENWOOD SPRINGS, CO 81602-1477
PO BOX 1478, GLENWOOD SPRINGS, CO 81602-1478
PO BOX 1479, GLENWOOD SPRINGS, CO 81602-1479
PO BOX 1480, GLENWOOD SPRINGS, CO 81602-1480
PO BOX 1481, GLENWOOD SPRINGS, CO 81602-1481
PO BOX 1482, GLENWOOD SPRINGS, CO 81602-1482
PO BOX 1483, GLENWOOD SPRINGS, CO 81602-1483
PO BOX 1484, GLENWOOD SPRINGS, CO 81602-1484
PO BOX 1485, GLENWOOD SPRINGS, CO 81602-1485
PO BOX 1486, GLENWOOD SPRINGS, CO 81602-1486
PO BOX 1487, GLENWOOD SPRINGS, CO 81602-1487
PO BOX 1488, GLENWOOD SPRINGS, CO 81602-1488
PO BOX 1489, GLENWOOD SPRINGS, CO 81602-1489
PO BOX 1490, GLENWOOD SPRINGS, CO 81602-1490
PO BOX 1491, GLENWOOD SPRINGS, CO 81602-1491
PO BOX 1492, GLENWOOD SPRINGS, CO 81602-1492
PO BOX 1493, GLENWOOD SPRINGS, CO 81602-1493
PO BOX 1494, GLENWOOD SPRINGS, CO 81602-1494
PO BOX 1495, GLENWOOD SPRINGS, CO 81602-1495
PO BOX 1496, GLENWOOD SPRINGS, CO 81602-1496
PO BOX 1497, GLENWOOD SPRINGS, CO 81602-1497
PO BOX 1498, GLENWOOD SPRINGS, CO 81602-1498
PO BOX 1499, GLENWOOD SPRINGS, CO 81602-1499
PO BOX 1500, GLENWOOD SPRINGS, CO 81602-1500
PO BOX 1501, GLENWOOD SPRINGS, CO 81602-1501
PO BOX 1502, GLENWOOD SPRINGS, CO 81602-1502
PO BOX 1503, GLENWOOD SPRINGS, CO 81602-1503
PO BOX 1504, GLENWOOD SPRINGS, CO 81602-1504
PO BOX 1505, GLENWOOD SPRINGS, CO 81602-1505
PO BOX 1506, GLENWOOD SPRINGS, CO 81602-1506
PO BOX 1507, GLENWOOD SPRINGS, CO 81602-1507
PO BOX 1508, GLENWOOD SPRINGS, CO 81602-1508
PO BOX 1509, GLENWOOD SPRINGS, CO 81602-1509
PO BOX 1510, GLENWOOD SPRINGS, CO 81602-1510
PO BOX 1511, GLENWOOD SPRINGS, CO 81602-1511
PO BOX 1512, GLENWOOD SPRINGS, CO 81602-1512
PO BOX 1513, GLENWOOD SPRINGS, CO 81602-1513
PO BOX 1514, GLENWOOD SPRINGS, CO 81602-1514
PO BOX 1515, GLENWOOD SPRINGS, CO 81602-1515
PO BOX 1516, GLENWOOD SPRINGS, CO 81602-1516
PO BOX 1517, GLENWOOD SPRINGS, CO 81602-1517
PO BOX 1518, GLENWOOD SPRINGS, CO 81602-1518
PO BOX 1519, GLENWOOD SPRINGS, CO 81602-1519
PO BOX 1520, GLENWOOD SPRINGS, CO 81602-1520
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