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 181, FEDERALSBURG, MD 21632-0181
PO BOX 182, FEDERALSBURG, MD 21632-0182
PO BOX 183, FEDERALSBURG, MD 21632-0183
PO BOX 184, FEDERALSBURG, MD 21632-0184
PO BOX 185, FEDERALSBURG, MD 21632-0185
PO BOX 186, FEDERALSBURG, MD 21632-0186
PO BOX 187, FEDERALSBURG, MD 21632-0187
PO BOX 188, FEDERALSBURG, MD 21632-0188
PO BOX 189, FEDERALSBURG, MD 21632-0189
PO BOX 190, FEDERALSBURG, MD 21632-0190
PO BOX 191, FEDERALSBURG, MD 21632-0191
PO BOX 192, FEDERALSBURG, MD 21632-0192
PO BOX 193, FEDERALSBURG, MD 21632-0193
PO BOX 194, FEDERALSBURG, MD 21632-0194
PO BOX 195, FEDERALSBURG, MD 21632-0195
PO BOX 196, FEDERALSBURG, MD 21632-0196
PO BOX 197, FEDERALSBURG, MD 21632-0197
PO BOX 198, FEDERALSBURG, MD 21632-0198
PO BOX 199, FEDERALSBURG, MD 21632-0199
PO BOX 200, FEDERALSBURG, MD 21632-0200
PO BOX 201, FEDERALSBURG, MD 21632-0201
PO BOX 202, FEDERALSBURG, MD 21632-0202
PO BOX 203, FEDERALSBURG, MD 21632-0203
PO BOX 204, FEDERALSBURG, MD 21632-0204
PO BOX 205, FEDERALSBURG, MD 21632-0205
PO BOX 206, FEDERALSBURG, MD 21632-0206
PO BOX 207, FEDERALSBURG, MD 21632-0207
PO BOX 208, FEDERALSBURG, MD 21632-0208
PO BOX 209, FEDERALSBURG, MD 21632-0209
PO BOX 210, FEDERALSBURG, MD 21632-0210
PO BOX 211, FEDERALSBURG, MD 21632-0211
PO BOX 212, FEDERALSBURG, MD 21632-0212
PO BOX 213, FEDERALSBURG, MD 21632-0213
PO BOX 214, FEDERALSBURG, MD 21632-0214
PO BOX 215, FEDERALSBURG, MD 21632-0215
PO BOX 216, FEDERALSBURG, MD 21632-0216
PO BOX 217, FEDERALSBURG, MD 21632-0217
PO BOX 218, FEDERALSBURG, MD 21632-0218
PO BOX 219, FEDERALSBURG, MD 21632-0219
PO BOX 220, FEDERALSBURG, MD 21632-0220
PO BOX 221, FEDERALSBURG, MD 21632-0221
PO BOX 222, FEDERALSBURG, MD 21632-0222
PO BOX 223, FEDERALSBURG, MD 21632-0223
PO BOX 224, FEDERALSBURG, MD 21632-0224
PO BOX 225, FEDERALSBURG, MD 21632-0225
PO BOX 226, FEDERALSBURG, MD 21632-0226
PO BOX 227, FEDERALSBURG, MD 21632-0227
PO BOX 228, FEDERALSBURG, MD 21632-0228
PO BOX 229, FEDERALSBURG, MD 21632-0229
PO BOX 230, FEDERALSBURG, MD 21632-0230
PO BOX 231, FEDERALSBURG, MD 21632-0231
PO BOX 232, FEDERALSBURG, MD 21632-0232
PO BOX 233, FEDERALSBURG, MD 21632-0233
PO BOX 234, FEDERALSBURG, MD 21632-0234
PO BOX 235, FEDERALSBURG, MD 21632-0235
PO BOX 236, FEDERALSBURG, MD 21632-0236
PO BOX 237, FEDERALSBURG, MD 21632-0237
PO BOX 238, FEDERALSBURG, MD 21632-0238
PO BOX 239, FEDERALSBURG, MD 21632-0239
PO BOX 240, FEDERALSBURG, MD 21632-0240
PO BOX 241, FEDERALSBURG, MD 21632-0241
PO BOX 242, FEDERALSBURG, MD 21632-0242
PO BOX 243, FEDERALSBURG, MD 21632-0243
PO BOX 244, FEDERALSBURG, MD 21632-0244
PO BOX 245, FEDERALSBURG, MD 21632-0245
PO BOX 246, FEDERALSBURG, MD 21632-0246
PO BOX 247, FEDERALSBURG, MD 21632-0247
PO BOX 248, FEDERALSBURG, MD 21632-0248
PO BOX 249, FEDERALSBURG, MD 21632-0249
PO BOX 250, FEDERALSBURG, MD 21632-0250
PO BOX 251, FEDERALSBURG, MD 21632-0251
PO BOX 252, FEDERALSBURG, MD 21632-0252
PO BOX 253, FEDERALSBURG, MD 21632-0253
PO BOX 254, FEDERALSBURG, MD 21632-0254
PO BOX 255, FEDERALSBURG, MD 21632-0255
PO BOX 256, FEDERALSBURG, MD 21632-0256
PO BOX 257, FEDERALSBURG, MD 21632-0257
PO BOX 258, FEDERALSBURG, MD 21632-0258
PO BOX 259, FEDERALSBURG, MD 21632-0259
PO BOX 260, FEDERALSBURG, MD 21632-0260
PO BOX 261, FEDERALSBURG, MD 21632-0261
PO BOX 262, FEDERALSBURG, MD 21632-0262
PO BOX 263, FEDERALSBURG, MD 21632-0263
PO BOX 264, FEDERALSBURG, MD 21632-0264
PO BOX 265, FEDERALSBURG, MD 21632-0265
PO BOX 266, FEDERALSBURG, MD 21632-0266
PO BOX 267, FEDERALSBURG, MD 21632-0267
PO BOX 268, FEDERALSBURG, MD 21632-0268
PO BOX 269, FEDERALSBURG, MD 21632-0269
PO BOX 270, FEDERALSBURG, MD 21632-0270
PO BOX 271, FEDERALSBURG, MD 21632-0271
PO BOX 272, FEDERALSBURG, MD 21632-0272
PO BOX 273, FEDERALSBURG, MD 21632-0273
PO BOX 274, FEDERALSBURG, MD 21632-0274
PO BOX 275, FEDERALSBURG, MD 21632-0275
PO BOX 276, FEDERALSBURG, MD 21632-0276
PO BOX 277, FEDERALSBURG, MD 21632-0277
PO BOX 278, FEDERALSBURG, MD 21632-0278
PO BOX 279, FEDERALSBURG, MD 21632-0279
PO BOX 280, FEDERALSBURG, MD 21632-0280
PO BOX 281, FEDERALSBURG, MD 21632-0281
PO BOX 282, FEDERALSBURG, MD 21632-0282
PO BOX 283, FEDERALSBURG, MD 21632-0283
PO BOX 284, FEDERALSBURG, MD 21632-0284
PO BOX 285, FEDERALSBURG, MD 21632-0285
PO BOX 286, FEDERALSBURG, MD 21632-0286
PO BOX 287, FEDERALSBURG, MD 21632-0287
PO BOX 288, FEDERALSBURG, MD 21632-0288
PO BOX 289, FEDERALSBURG, MD 21632-0289
PO BOX 290, FEDERALSBURG, MD 21632-0290
PO BOX 291, FEDERALSBURG, MD 21632-0291
PO BOX 292, FEDERALSBURG, MD 21632-0292
PO BOX 293, FEDERALSBURG, MD 21632-0293
PO BOX 294, FEDERALSBURG, MD 21632-0294
PO BOX 295, FEDERALSBURG, MD 21632-0295
PO BOX 296, FEDERALSBURG, MD 21632-0296
PO BOX 297, FEDERALSBURG, MD 21632-0297
PO BOX 298, FEDERALSBURG, MD 21632-0298
PO BOX 299, FEDERALSBURG, MD 21632-0299
PO BOX 300, FEDERALSBURG, MD 21632-0300
PO BOX 301, FEDERALSBURG, MD 21632-0301
PO BOX 302, FEDERALSBURG, MD 21632-0302
PO BOX 303, FEDERALSBURG, MD 21632-0303
PO BOX 304, FEDERALSBURG, MD 21632-0304
PO BOX 305, FEDERALSBURG, MD 21632-0305
PO BOX 306, FEDERALSBURG, MD 21632-0306
PO BOX 307, FEDERALSBURG, MD 21632-0307
PO BOX 308, FEDERALSBURG, MD 21632-0308
PO BOX 309, FEDERALSBURG, MD 21632-0309
PO BOX 310, FEDERALSBURG, MD 21632-0310
PO BOX 311, FEDERALSBURG, MD 21632-0311
PO BOX 312, FEDERALSBURG, MD 21632-0312
PO BOX 313, FEDERALSBURG, MD 21632-0313
PO BOX 314, FEDERALSBURG, MD 21632-0314
PO BOX 315, FEDERALSBURG, MD 21632-0315
PO BOX 316, FEDERALSBURG, MD 21632-0316
PO BOX 317, FEDERALSBURG, MD 21632-0317
PO BOX 318, FEDERALSBURG, MD 21632-0318
PO BOX 319, FEDERALSBURG, MD 21632-0319
PO BOX 320, FEDERALSBURG, MD 21632-0320
PO BOX 321, FEDERALSBURG, MD 21632-0321
PO BOX 322, FEDERALSBURG, MD 21632-0322
PO BOX 323, FEDERALSBURG, MD 21632-0323
PO BOX 324, FEDERALSBURG, MD 21632-0324
PO BOX 325, FEDERALSBURG, MD 21632-0325
PO BOX 326, FEDERALSBURG, MD 21632-0326
PO BOX 327, FEDERALSBURG, MD 21632-0327
PO BOX 328, FEDERALSBURG, MD 21632-0328
PO BOX 329, FEDERALSBURG, MD 21632-0329
PO BOX 330, FEDERALSBURG, MD 21632-0330
PO BOX 331, FEDERALSBURG, MD 21632-0331
PO BOX 332, FEDERALSBURG, MD 21632-0332
PO BOX 333, FEDERALSBURG, MD 21632-0333
PO BOX 334, FEDERALSBURG, MD 21632-0334
PO BOX 335, FEDERALSBURG, MD 21632-0335
PO BOX 336, FEDERALSBURG, MD 21632-0336
PO BOX 337, FEDERALSBURG, MD 21632-0337
PO BOX 338, FEDERALSBURG, MD 21632-0338
PO BOX 339, FEDERALSBURG, MD 21632-0339
PO BOX 340, FEDERALSBURG, MD 21632-0340
PO BOX 341, FEDERALSBURG, MD 21632-0341
PO BOX 342, FEDERALSBURG, MD 21632-0342
PO BOX 343, FEDERALSBURG, MD 21632-0343
PO BOX 344, FEDERALSBURG, MD 21632-0344
PO BOX 345, FEDERALSBURG, MD 21632-0345
PO BOX 346, FEDERALSBURG, MD 21632-0346
PO BOX 347, FEDERALSBURG, MD 21632-0347
PO BOX 348, FEDERALSBURG, MD 21632-0348
PO BOX 349, FEDERALSBURG, MD 21632-0349
PO BOX 350, FEDERALSBURG, MD 21632-0350
PO BOX 351, FEDERALSBURG, MD 21632-0351
PO BOX 352, FEDERALSBURG, MD 21632-0352
PO BOX 353, FEDERALSBURG, MD 21632-0353
PO BOX 354, FEDERALSBURG, MD 21632-0354
PO BOX 355, FEDERALSBURG, MD 21632-0355
PO BOX 356, FEDERALSBURG, MD 21632-0356
PO BOX 357, FEDERALSBURG, MD 21632-0357
PO BOX 358, FEDERALSBURG, MD 21632-0358
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