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 1181, SPRINGFIELD, MO 65801-1181
PO BOX 1182, SPRINGFIELD, MO 65801-1182
PO BOX 1183, SPRINGFIELD, MO 65801-1183
PO BOX 1184, SPRINGFIELD, MO 65801-1184
PO BOX 1185, SPRINGFIELD, MO 65801-1185
PO BOX 1186, SPRINGFIELD, MO 65801-1186
PO BOX 1187, SPRINGFIELD, MO 65801-1187
PO BOX 1188, SPRINGFIELD, MO 65801-1188
PO BOX 1189, SPRINGFIELD, MO 65801-1189
PO BOX 1190, SPRINGFIELD, MO 65801-1190
PO BOX 1191, SPRINGFIELD, MO 65801-1191
PO BOX 1192, SPRINGFIELD, MO 65801-1192
PO BOX 1193, SPRINGFIELD, MO 65801-1193
PO BOX 1194, SPRINGFIELD, MO 65801-1194
PO BOX 1195, SPRINGFIELD, MO 65801-1195
PO BOX 1196, SPRINGFIELD, MO 65801-1196
PO BOX 1197, SPRINGFIELD, MO 65801-1197
PO BOX 1198, SPRINGFIELD, MO 65801-1198
PO BOX 1199, SPRINGFIELD, MO 65801-1199
PO BOX 1200, SPRINGFIELD, MO 65801-1200
PO BOX 1201, SPRINGFIELD, MO 65801-1201
PO BOX 1202, SPRINGFIELD, MO 65801-1202
PO BOX 1203, SPRINGFIELD, MO 65801-1203
PO BOX 1204, SPRINGFIELD, MO 65801-1204
PO BOX 1205, SPRINGFIELD, MO 65801-1205
PO BOX 1206, SPRINGFIELD, MO 65801-1206
PO BOX 1207, SPRINGFIELD, MO 65801-1207
PO BOX 1208, SPRINGFIELD, MO 65801-1208
PO BOX 1209, SPRINGFIELD, MO 65801-1209
PO BOX 1210, SPRINGFIELD, MO 65801-1210
PO BOX 1211, SPRINGFIELD, MO 65801-1211
PO BOX 1212, SPRINGFIELD, MO 65801-1212
PO BOX 1213, SPRINGFIELD, MO 65801-1213
PO BOX 1214, SPRINGFIELD, MO 65801-1214
PO BOX 1215, SPRINGFIELD, MO 65801-1215
PO BOX 1216, SPRINGFIELD, MO 65801-1216
PO BOX 1217, SPRINGFIELD, MO 65801-1217
PO BOX 1218, SPRINGFIELD, MO 65801-1218
PO BOX 1219, SPRINGFIELD, MO 65801-1219
PO BOX 1220, SPRINGFIELD, MO 65801-1220
PO BOX 1221, SPRINGFIELD, MO 65801-1221
PO BOX 1222, SPRINGFIELD, MO 65801-1222
PO BOX 1223, SPRINGFIELD, MO 65801-1223
PO BOX 1224, SPRINGFIELD, MO 65801-1224
PO BOX 1225, SPRINGFIELD, MO 65801-1225
PO BOX 1226, SPRINGFIELD, MO 65801-1226
PO BOX 1227, SPRINGFIELD, MO 65801-1227
PO BOX 1228, SPRINGFIELD, MO 65801-1228
PO BOX 1229, SPRINGFIELD, MO 65801-1229
PO BOX 1230, SPRINGFIELD, MO 65801-1230
PO BOX 1231, SPRINGFIELD, MO 65801-1231
PO BOX 1232, SPRINGFIELD, MO 65801-1232
PO BOX 1233, SPRINGFIELD, MO 65801-1233
PO BOX 1234, SPRINGFIELD, MO 65801-1234
PO BOX 1235, SPRINGFIELD, MO 65801-1235
PO BOX 1236, SPRINGFIELD, MO 65801-1236
PO BOX 1237, SPRINGFIELD, MO 65801-1237
PO BOX 1238, SPRINGFIELD, MO 65801-1238
PO BOX 1239, SPRINGFIELD, MO 65801-1239
PO BOX 1240, SPRINGFIELD, MO 65801-1240
PO BOX 1241, SPRINGFIELD, MO 65801-1241
PO BOX 1242, SPRINGFIELD, MO 65801-1242
PO BOX 1243, SPRINGFIELD, MO 65801-1243
PO BOX 1244, SPRINGFIELD, MO 65801-1244
PO BOX 1245, SPRINGFIELD, MO 65801-1245
PO BOX 1246, SPRINGFIELD, MO 65801-1246
PO BOX 1247, SPRINGFIELD, MO 65801-1247
PO BOX 1248, SPRINGFIELD, MO 65801-1248
PO BOX 1249, SPRINGFIELD, MO 65801-1249
PO BOX 1250, SPRINGFIELD, MO 65801-1250
PO BOX 1251, SPRINGFIELD, MO 65801-1251
PO BOX 1252, SPRINGFIELD, MO 65801-1252
PO BOX 1253, SPRINGFIELD, MO 65801-1253
PO BOX 1254, SPRINGFIELD, MO 65801-1254
PO BOX 1255, SPRINGFIELD, MO 65801-1255
PO BOX 1256, SPRINGFIELD, MO 65801-1256
PO BOX 1257, SPRINGFIELD, MO 65801-1257
PO BOX 1258, SPRINGFIELD, MO 65801-1258
PO BOX 1259, SPRINGFIELD, MO 65801-1259
PO BOX 1260, SPRINGFIELD, MO 65801-1260
PO BOX 1261, SPRINGFIELD, MO 65801-1261
PO BOX 1262, SPRINGFIELD, MO 65801-1262
PO BOX 1263, SPRINGFIELD, MO 65801-1263
PO BOX 1264, SPRINGFIELD, MO 65801-1264
PO BOX 1265, SPRINGFIELD, MO 65801-1265
PO BOX 1266, SPRINGFIELD, MO 65801-1266
PO BOX 1267, SPRINGFIELD, MO 65801-1267
PO BOX 1268, SPRINGFIELD, MO 65801-1268
PO BOX 1269, SPRINGFIELD, MO 65801-1269
PO BOX 1270, SPRINGFIELD, MO 65801-1270
PO BOX 1271, SPRINGFIELD, MO 65801-1271
PO BOX 1272, SPRINGFIELD, MO 65801-1272
PO BOX 1273, SPRINGFIELD, MO 65801-1273
PO BOX 1274, SPRINGFIELD, MO 65801-1274
PO BOX 1275, SPRINGFIELD, MO 65801-1275
PO BOX 1276, SPRINGFIELD, MO 65801-1276
PO BOX 1277, SPRINGFIELD, MO 65801-1277
PO BOX 1278, SPRINGFIELD, MO 65801-1278
PO BOX 1279, SPRINGFIELD, MO 65801-1279
PO BOX 1280, SPRINGFIELD, MO 65801-1280
PO BOX 1281, SPRINGFIELD, MO 65801-1281
PO BOX 1282, SPRINGFIELD, MO 65801-1282
PO BOX 1283, SPRINGFIELD, MO 65801-1283
PO BOX 1284, SPRINGFIELD, MO 65801-1284
PO BOX 1285, SPRINGFIELD, MO 65801-1285
PO BOX 1286, SPRINGFIELD, MO 65801-1286
PO BOX 1287, SPRINGFIELD, MO 65801-1287
PO BOX 1288, SPRINGFIELD, MO 65801-1288
PO BOX 1289, SPRINGFIELD, MO 65801-1289
PO BOX 1290, SPRINGFIELD, MO 65801-1290
PO BOX 1291, SPRINGFIELD, MO 65801-1291
PO BOX 1292, SPRINGFIELD, MO 65801-1292
PO BOX 1293, SPRINGFIELD, MO 65801-1293
PO BOX 1294, SPRINGFIELD, MO 65801-1294
PO BOX 1295, SPRINGFIELD, MO 65801-1295
PO BOX 1296, SPRINGFIELD, MO 65801-1296
PO BOX 1297, SPRINGFIELD, MO 65801-1297
PO BOX 1298, SPRINGFIELD, MO 65801-1298
PO BOX 1299, SPRINGFIELD, MO 65801-1299
PO BOX 1300, SPRINGFIELD, MO 65801-1300
PO BOX 1301, SPRINGFIELD, MO 65801-1301
PO BOX 1302, SPRINGFIELD, MO 65801-1302
PO BOX 1303, SPRINGFIELD, MO 65801-1303
PO BOX 1304, SPRINGFIELD, MO 65801-1304
PO BOX 1305, SPRINGFIELD, MO 65801-1305
PO BOX 1306, SPRINGFIELD, MO 65801-1306
PO BOX 1307, SPRINGFIELD, MO 65801-1307
PO BOX 1308, SPRINGFIELD, MO 65801-1308
PO BOX 1309, SPRINGFIELD, MO 65801-1309
PO BOX 1310, SPRINGFIELD, MO 65801-1310
PO BOX 1311, SPRINGFIELD, MO 65801-1311
PO BOX 1312, SPRINGFIELD, MO 65801-1312
PO BOX 1313, SPRINGFIELD, MO 65801-1313
PO BOX 1314, SPRINGFIELD, MO 65801-1314
PO BOX 1315, SPRINGFIELD, MO 65801-1315
PO BOX 1316, SPRINGFIELD, MO 65801-1316
PO BOX 1317, SPRINGFIELD, MO 65801-1317
PO BOX 1318, SPRINGFIELD, MO 65801-1318
PO BOX 1319, SPRINGFIELD, MO 65801-1319
PO BOX 1320, SPRINGFIELD, MO 65801-1320
PO BOX 1321, SPRINGFIELD, MO 65801-1321
PO BOX 1322, SPRINGFIELD, MO 65801-1322
PO BOX 1323, SPRINGFIELD, MO 65801-1323
PO BOX 1324, SPRINGFIELD, MO 65801-1324
PO BOX 1325, SPRINGFIELD, MO 65801-1325
PO BOX 1326, SPRINGFIELD, MO 65801-1326
PO BOX 1327, SPRINGFIELD, MO 65801-1327
PO BOX 1328, SPRINGFIELD, MO 65801-1328
PO BOX 1329, SPRINGFIELD, MO 65801-1329
PO BOX 1330, SPRINGFIELD, MO 65801-1330
PO BOX 1331, SPRINGFIELD, MO 65801-1331
PO BOX 1332, SPRINGFIELD, MO 65801-1332
PO BOX 1333, SPRINGFIELD, MO 65801-1333
PO BOX 1334, SPRINGFIELD, MO 65801-1334
PO BOX 1335, SPRINGFIELD, MO 65801-1335
PO BOX 1336, SPRINGFIELD, MO 65801-1336
PO BOX 1337, SPRINGFIELD, MO 65801-1337
PO BOX 1338, SPRINGFIELD, MO 65801-1338
PO BOX 1339, SPRINGFIELD, MO 65801-1339
PO BOX 1340, SPRINGFIELD, MO 65801-1340
PO BOX 1341, SPRINGFIELD, MO 65801-1341
PO BOX 1342, SPRINGFIELD, MO 65801-1342
PO BOX 1343, SPRINGFIELD, MO 65801-1343
PO BOX 1344, SPRINGFIELD, MO 65801-1344
PO BOX 1345, SPRINGFIELD, MO 65801-1345
PO BOX 1346, SPRINGFIELD, MO 65801-1346
PO BOX 1347, SPRINGFIELD, MO 65801-1347
PO BOX 1348, SPRINGFIELD, MO 65801-1348
PO BOX 1349, SPRINGFIELD, MO 65801-1349
PO BOX 1350, SPRINGFIELD, MO 65801-1350
PO BOX 1351, SPRINGFIELD, MO 65801-1351
PO BOX 1352, SPRINGFIELD, MO 65801-1352
PO BOX 1353, SPRINGFIELD, MO 65801-1353
PO BOX 1354, SPRINGFIELD, MO 65801-1354
PO BOX 1355, SPRINGFIELD, MO 65801-1355
PO BOX 1356, SPRINGFIELD, MO 65801-1356
PO BOX 1357, SPRINGFIELD, MO 65801-1357
PO BOX 1358, SPRINGFIELD, MO 65801-1358
PO BOX 1359, SPRINGFIELD, MO 65801-1359
PO BOX 1360, SPRINGFIELD, MO 65801-1360
PO BOX 1361, SPRINGFIELD, MO 65801-1361
PO BOX 1362, SPRINGFIELD, MO 65801-1362
PO BOX 1363, SPRINGFIELD, MO 65801-1363
PO BOX 1364, SPRINGFIELD, MO 65801-1364
PO BOX 1365, SPRINGFIELD, MO 65801-1365
PO BOX 1366, SPRINGFIELD, MO 65801-1366
PO BOX 1367, SPRINGFIELD, MO 65801-1367
PO BOX 1368, SPRINGFIELD, MO 65801-1368
PO BOX 1369, SPRINGFIELD, MO 65801-1369
PO BOX 1370, SPRINGFIELD, MO 65801-1370
PO BOX 1371, SPRINGFIELD, MO 65801-1371
PO BOX 1372, SPRINGFIELD, MO 65801-1372
PO BOX 1373, SPRINGFIELD, MO 65801-1373
PO BOX 1374, SPRINGFIELD, MO 65801-1374
PO BOX 1375, SPRINGFIELD, MO 65801-1375
PO BOX 1376, SPRINGFIELD, MO 65801-1376
PO BOX 1377, SPRINGFIELD, MO 65801-1377
PO BOX 1378, SPRINGFIELD, MO 65801-1378
PO BOX 1379, SPRINGFIELD, MO 65801-1379
PO BOX 1380, SPRINGFIELD, MO 65801-1380
PO BOX 1381, SPRINGFIELD, MO 65801-1381
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