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 81281, SPRINGFIELD, MA 01138-1281
PO BOX 81282, SPRINGFIELD, MA 01138-1282
PO BOX 81283, SPRINGFIELD, MA 01138-1283
PO BOX 81284, SPRINGFIELD, MA 01138-1284
PO BOX 81285, SPRINGFIELD, MA 01138-1285
PO BOX 81286, SPRINGFIELD, MA 01138-1286
PO BOX 81287, SPRINGFIELD, MA 01138-1287
PO BOX 81288, SPRINGFIELD, MA 01138-1288
PO BOX 81289, SPRINGFIELD, MA 01138-1289
PO BOX 81290, SPRINGFIELD, MA 01138-1290
PO BOX 81291, SPRINGFIELD, MA 01138-1291
PO BOX 81292, SPRINGFIELD, MA 01138-1292
PO BOX 81293, SPRINGFIELD, MA 01138-1293
PO BOX 81294, SPRINGFIELD, MA 01138-1294
PO BOX 81295, SPRINGFIELD, MA 01138-1295
PO BOX 81296, SPRINGFIELD, MA 01138-1296
PO BOX 81297, SPRINGFIELD, MA 01138-1297
PO BOX 81298, SPRINGFIELD, MA 01138-1298
PO BOX 81299, SPRINGFIELD, MA 01138-1299
PO BOX 81300, SPRINGFIELD, MA 01138-1300
PO BOX 81301, SPRINGFIELD, MA 01138-1301
PO BOX 81302, SPRINGFIELD, MA 01138-1302
PO BOX 81303, SPRINGFIELD, MA 01138-1303
PO BOX 81304, SPRINGFIELD, MA 01138-1304
PO BOX 81305, SPRINGFIELD, MA 01138-1305
PO BOX 81306, SPRINGFIELD, MA 01138-1306
PO BOX 81307, SPRINGFIELD, MA 01138-1307
PO BOX 81308, SPRINGFIELD, MA 01138-1308
PO BOX 81309, SPRINGFIELD, MA 01138-1309
PO BOX 81310, SPRINGFIELD, MA 01138-1310
PO BOX 81311, SPRINGFIELD, MA 01138-1311
PO BOX 81312, SPRINGFIELD, MA 01138-1312
PO BOX 81313, SPRINGFIELD, MA 01138-1313
PO BOX 81314, SPRINGFIELD, MA 01138-1314
PO BOX 81315, SPRINGFIELD, MA 01138-1315
PO BOX 81316, SPRINGFIELD, MA 01138-1316
PO BOX 81317, SPRINGFIELD, MA 01138-1317
PO BOX 81318, SPRINGFIELD, MA 01138-1318
PO BOX 81319, SPRINGFIELD, MA 01138-1319
PO BOX 81320, SPRINGFIELD, MA 01138-1320
PO BOX 81321, SPRINGFIELD, MA 01138-1321
PO BOX 81322, SPRINGFIELD, MA 01138-1322
PO BOX 81323, SPRINGFIELD, MA 01138-1323
PO BOX 81324, SPRINGFIELD, MA 01138-1324
PO BOX 81325, SPRINGFIELD, MA 01138-1325
PO BOX 81326, SPRINGFIELD, MA 01138-1326
PO BOX 81327, SPRINGFIELD, MA 01138-1327
PO BOX 81328, SPRINGFIELD, MA 01138-1328
PO BOX 81329, SPRINGFIELD, MA 01138-1329
PO BOX 81330, SPRINGFIELD, MA 01138-1330
PO BOX 81331, SPRINGFIELD, MA 01138-1331
PO BOX 81332, SPRINGFIELD, MA 01138-1332
PO BOX 81333, SPRINGFIELD, MA 01138-1333
PO BOX 81334, SPRINGFIELD, MA 01138-1334
PO BOX 81335, SPRINGFIELD, MA 01138-1335
PO BOX 81336, SPRINGFIELD, MA 01138-1336
PO BOX 81337, SPRINGFIELD, MA 01138-1337
PO BOX 81338, SPRINGFIELD, MA 01138-1338
PO BOX 81339, SPRINGFIELD, MA 01138-1339
PO BOX 81340, SPRINGFIELD, MA 01138-1340
PO BOX 81341, SPRINGFIELD, MA 01138-1341
PO BOX 81342, SPRINGFIELD, MA 01138-1342
PO BOX 81343, SPRINGFIELD, MA 01138-1343
PO BOX 81344, SPRINGFIELD, MA 01138-1344
PO BOX 81345, SPRINGFIELD, MA 01138-1345
PO BOX 81346, SPRINGFIELD, MA 01138-1346
PO BOX 81347, SPRINGFIELD, MA 01138-1347
PO BOX 81348, SPRINGFIELD, MA 01138-1348
PO BOX 81349, SPRINGFIELD, MA 01138-1349
PO BOX 81350, SPRINGFIELD, MA 01138-1350
PO BOX 81351, SPRINGFIELD, MA 01138-1351
PO BOX 81352, SPRINGFIELD, MA 01138-1352
PO BOX 81353, SPRINGFIELD, MA 01138-1353
PO BOX 81354, SPRINGFIELD, MA 01138-1354
PO BOX 81355, SPRINGFIELD, MA 01138-1355
PO BOX 81356, SPRINGFIELD, MA 01138-1356
PO BOX 81357, SPRINGFIELD, MA 01138-1357
PO BOX 81358, SPRINGFIELD, MA 01138-1358
PO BOX 81359, SPRINGFIELD, MA 01138-1359
PO BOX 81360, SPRINGFIELD, MA 01138-1360
PO BOX 81361, SPRINGFIELD, MA 01138-1361
PO BOX 81362, SPRINGFIELD, MA 01138-1362
PO BOX 81363, SPRINGFIELD, MA 01138-1363
PO BOX 81364, SPRINGFIELD, MA 01138-1364
PO BOX 81365, SPRINGFIELD, MA 01138-1365
PO BOX 81366, SPRINGFIELD, MA 01138-1366
PO BOX 81367, SPRINGFIELD, MA 01138-1367
PO BOX 81368, SPRINGFIELD, MA 01138-1368
PO BOX 81369, SPRINGFIELD, MA 01138-1369
PO BOX 81370, SPRINGFIELD, MA 01138-1370
PO BOX 81371, SPRINGFIELD, MA 01138-1371
PO BOX 81372, SPRINGFIELD, MA 01138-1372
PO BOX 81373, SPRINGFIELD, MA 01138-1373
PO BOX 81374, SPRINGFIELD, MA 01138-1374
PO BOX 81375, SPRINGFIELD, MA 01138-1375
PO BOX 81376, SPRINGFIELD, MA 01138-1376
PO BOX 81377, SPRINGFIELD, MA 01138-1377
PO BOX 81378, SPRINGFIELD, MA 01138-1378
PO BOX 81379, SPRINGFIELD, MA 01138-1379
PO BOX 81380, SPRINGFIELD, MA 01138-1380
PO BOX 81381, SPRINGFIELD, MA 01138-1381
PO BOX 81382, SPRINGFIELD, MA 01138-1382
PO BOX 81383, SPRINGFIELD, MA 01138-1383
PO BOX 81384, SPRINGFIELD, MA 01138-1384
PO BOX 81385, SPRINGFIELD, MA 01138-1385
PO BOX 81386, SPRINGFIELD, MA 01138-1386
PO BOX 81387, SPRINGFIELD, MA 01138-1387
PO BOX 81388, SPRINGFIELD, MA 01138-1388
PO BOX 81389, SPRINGFIELD, MA 01138-1389
PO BOX 81390, SPRINGFIELD, MA 01138-1390
PO BOX 81391, SPRINGFIELD, MA 01138-1391
PO BOX 81392, SPRINGFIELD, MA 01138-1392
PO BOX 81393, SPRINGFIELD, MA 01138-1393
PO BOX 81394, SPRINGFIELD, MA 01138-1394
PO BOX 81395, SPRINGFIELD, MA 01138-1395
PO BOX 81396, SPRINGFIELD, MA 01138-1396
PO BOX 81397, SPRINGFIELD, MA 01138-1397
PO BOX 81398, SPRINGFIELD, MA 01138-1398
PO BOX 81399, SPRINGFIELD, MA 01138-1399
PO BOX 81400, SPRINGFIELD, MA 01138-1400
PO BOX 81401, SPRINGFIELD, MA 01138-1401
PO BOX 81402, SPRINGFIELD, MA 01138-1402
PO BOX 81403, SPRINGFIELD, MA 01138-1403
PO BOX 81404, SPRINGFIELD, MA 01138-1404
PO BOX 81405, SPRINGFIELD, MA 01138-1405
PO BOX 81406, SPRINGFIELD, MA 01138-1406
PO BOX 81407, SPRINGFIELD, MA 01138-1407
PO BOX 81408, SPRINGFIELD, MA 01138-1408
PO BOX 81409, SPRINGFIELD, MA 01138-1409
PO BOX 81410, SPRINGFIELD, MA 01138-1410
PO BOX 81411, SPRINGFIELD, MA 01138-1411
PO BOX 81412, SPRINGFIELD, MA 01138-1412
PO BOX 81413, SPRINGFIELD, MA 01138-1413
PO BOX 81414, SPRINGFIELD, MA 01138-1414
PO BOX 81415, SPRINGFIELD, MA 01138-1415
PO BOX 81416, SPRINGFIELD, MA 01138-1416
PO BOX 81417, SPRINGFIELD, MA 01138-1417
PO BOX 81418, SPRINGFIELD, MA 01138-1418
PO BOX 81419, SPRINGFIELD, MA 01138-1419
PO BOX 81420, SPRINGFIELD, MA 01138-1420
PO BOX 81421, SPRINGFIELD, MA 01138-1421
PO BOX 81422, SPRINGFIELD, MA 01138-1422
PO BOX 81423, SPRINGFIELD, MA 01138-1423
PO BOX 81424, SPRINGFIELD, MA 01138-1424
PO BOX 81425, SPRINGFIELD, MA 01138-1425
PO BOX 81426, SPRINGFIELD, MA 01138-1426
PO BOX 81427, SPRINGFIELD, MA 01138-1427
PO BOX 81428, SPRINGFIELD, MA 01138-1428
PO BOX 81429, SPRINGFIELD, MA 01138-1429
PO BOX 81430, SPRINGFIELD, MA 01138-1430
PO BOX 81431, SPRINGFIELD, MA 01138-1431
PO BOX 81432, SPRINGFIELD, MA 01138-1432
PO BOX 81433, SPRINGFIELD, MA 01138-1433
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