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 2181, CALIFORNIA CITY, CA 93504-0181
PO BOX 2182, CALIFORNIA CITY, CA 93504-0182
PO BOX 2183, CALIFORNIA CITY, CA 93504-0183
PO BOX 2184, CALIFORNIA CITY, CA 93504-0184
PO BOX 2185, CALIFORNIA CITY, CA 93504-0185
PO BOX 2186, CALIFORNIA CITY, CA 93504-0186
PO BOX 2187, CALIFORNIA CITY, CA 93504-0187
PO BOX 2188, CALIFORNIA CITY, CA 93504-0188
PO BOX 2189, CALIFORNIA CITY, CA 93504-0189
PO BOX 2190, CALIFORNIA CITY, CA 93504-0190
PO BOX 2191, CALIFORNIA CITY, CA 93504-0191
PO BOX 2192, CALIFORNIA CITY, CA 93504-0192
PO BOX 2193, CALIFORNIA CITY, CA 93504-0193
PO BOX 2194, CALIFORNIA CITY, CA 93504-0194
PO BOX 2195, CALIFORNIA CITY, CA 93504-0195
PO BOX 2196, CALIFORNIA CITY, CA 93504-0196
PO BOX 2197, CALIFORNIA CITY, CA 93504-0197
PO BOX 2198, CALIFORNIA CITY, CA 93504-0198
PO BOX 2199, CALIFORNIA CITY, CA 93504-0199
PO BOX 2200, CALIFORNIA CITY, CA 93504-0200
PO BOX 2201, CALIFORNIA CITY, CA 93504-0201
PO BOX 2202, CALIFORNIA CITY, CA 93504-0202
PO BOX 2203, CALIFORNIA CITY, CA 93504-0203
PO BOX 2204, CALIFORNIA CITY, CA 93504-0204
PO BOX 2205, CALIFORNIA CITY, CA 93504-0205
PO BOX 2206, CALIFORNIA CITY, CA 93504-0206
PO BOX 2207, CALIFORNIA CITY, CA 93504-0207
PO BOX 2208, CALIFORNIA CITY, CA 93504-0208
PO BOX 2209, CALIFORNIA CITY, CA 93504-0209
PO BOX 2210, CALIFORNIA CITY, CA 93504-0210
PO BOX 2211, CALIFORNIA CITY, CA 93504-0211
PO BOX 2212, CALIFORNIA CITY, CA 93504-0212
PO BOX 2213, CALIFORNIA CITY, CA 93504-0213
PO BOX 2214, CALIFORNIA CITY, CA 93504-0214
PO BOX 2215, CALIFORNIA CITY, CA 93504-0215
PO BOX 2216, CALIFORNIA CITY, CA 93504-0216
PO BOX 2217, CALIFORNIA CITY, CA 93504-0217
PO BOX 2218, CALIFORNIA CITY, CA 93504-0218
PO BOX 2219, CALIFORNIA CITY, CA 93504-0219
PO BOX 2220, CALIFORNIA CITY, CA 93504-0220
PO BOX 2221, CALIFORNIA CITY, CA 93504-0221
PO BOX 2222, CALIFORNIA CITY, CA 93504-0222
PO BOX 2223, CALIFORNIA CITY, CA 93504-0223
PO BOX 2224, CALIFORNIA CITY, CA 93504-0224
PO BOX 2225, CALIFORNIA CITY, CA 93504-0225
PO BOX 2226, CALIFORNIA CITY, CA 93504-0226
PO BOX 2227, CALIFORNIA CITY, CA 93504-0227
PO BOX 2228, CALIFORNIA CITY, CA 93504-0228
PO BOX 2229, CALIFORNIA CITY, CA 93504-0229
PO BOX 2230, CALIFORNIA CITY, CA 93504-0230
PO BOX 2231, CALIFORNIA CITY, CA 93504-0231
PO BOX 2232, CALIFORNIA CITY, CA 93504-0232
PO BOX 2233, CALIFORNIA CITY, CA 93504-0233
PO BOX 2234, CALIFORNIA CITY, CA 93504-0234
PO BOX 2235, CALIFORNIA CITY, CA 93504-0235
PO BOX 2236, CALIFORNIA CITY, CA 93504-0236
PO BOX 2237, CALIFORNIA CITY, CA 93504-0237
PO BOX 2238, CALIFORNIA CITY, CA 93504-0238
PO BOX 2239, CALIFORNIA CITY, CA 93504-0239
PO BOX 2240, CALIFORNIA CITY, CA 93504-0240
PO BOX 2241, CALIFORNIA CITY, CA 93504-0241
PO BOX 2242, CALIFORNIA CITY, CA 93504-0242
PO BOX 2243, CALIFORNIA CITY, CA 93504-0243
PO BOX 2244, CALIFORNIA CITY, CA 93504-0244
PO BOX 2245, CALIFORNIA CITY, CA 93504-0245
PO BOX 2246, CALIFORNIA CITY, CA 93504-0246
PO BOX 2247, CALIFORNIA CITY, CA 93504-0247
PO BOX 2248, CALIFORNIA CITY, CA 93504-0248
PO BOX 2249, CALIFORNIA CITY, CA 93504-0249
PO BOX 2250, CALIFORNIA CITY, CA 93504-0250
PO BOX 2251, CALIFORNIA CITY, CA 93504-0251
PO BOX 2252, CALIFORNIA CITY, CA 93504-0252
PO BOX 2253, CALIFORNIA CITY, CA 93504-0253
PO BOX 2254, CALIFORNIA CITY, CA 93504-0254
PO BOX 2255, CALIFORNIA CITY, CA 93504-0255
PO BOX 2256, CALIFORNIA CITY, CA 93504-0256
PO BOX 2257, CALIFORNIA CITY, CA 93504-0257
PO BOX 2258, CALIFORNIA CITY, CA 93504-0258
PO BOX 2259, CALIFORNIA CITY, CA 93504-0259
PO BOX 2260, CALIFORNIA CITY, CA 93504-0260
PO BOX 2261, CALIFORNIA CITY, CA 93504-0261
PO BOX 2262, CALIFORNIA CITY, CA 93504-0262
PO BOX 2263, CALIFORNIA CITY, CA 93504-0263
PO BOX 2264, CALIFORNIA CITY, CA 93504-0264
PO BOX 2265, CALIFORNIA CITY, CA 93504-0265
PO BOX 2266, CALIFORNIA CITY, CA 93504-0266
PO BOX 2267, CALIFORNIA CITY, CA 93504-0267
PO BOX 2268, CALIFORNIA CITY, CA 93504-0268
PO BOX 2269, CALIFORNIA CITY, CA 93504-0269
PO BOX 2270, CALIFORNIA CITY, CA 93504-0270
PO BOX 2271, CALIFORNIA CITY, CA 93504-0271
PO BOX 2272, CALIFORNIA CITY, CA 93504-0272
PO BOX 2273, CALIFORNIA CITY, CA 93504-0273
PO BOX 2274, CALIFORNIA CITY, CA 93504-0274
PO BOX 2275, CALIFORNIA CITY, CA 93504-0275
PO BOX 2276, CALIFORNIA CITY, CA 93504-0276
PO BOX 2277, CALIFORNIA CITY, CA 93504-0277
PO BOX 2278, CALIFORNIA CITY, CA 93504-0278
PO BOX 2279, CALIFORNIA CITY, CA 93504-0279
PO BOX 2280, CALIFORNIA CITY, CA 93504-0280
PO BOX 2281, CALIFORNIA CITY, CA 93504-0281
PO BOX 2282, CALIFORNIA CITY, CA 93504-0282
PO BOX 2283, CALIFORNIA CITY, CA 93504-0283
PO BOX 2284, CALIFORNIA CITY, CA 93504-0284
PO BOX 2285, CALIFORNIA CITY, CA 93504-0285
PO BOX 2286, CALIFORNIA CITY, CA 93504-0286
PO BOX 2287, CALIFORNIA CITY, CA 93504-0287
PO BOX 2288, CALIFORNIA CITY, CA 93504-0288
PO BOX 2289, CALIFORNIA CITY, CA 93504-0289
PO BOX 2290, CALIFORNIA CITY, CA 93504-0290
PO BOX 2291, CALIFORNIA CITY, CA 93504-0291
PO BOX 2292, CALIFORNIA CITY, CA 93504-0292
PO BOX 2293, CALIFORNIA CITY, CA 93504-0293
PO BOX 2294, CALIFORNIA CITY, CA 93504-0294
PO BOX 2295, CALIFORNIA CITY, CA 93504-0295
PO BOX 2296, CALIFORNIA CITY, CA 93504-0296
PO BOX 2297, CALIFORNIA CITY, CA 93504-0297
PO BOX 2298, CALIFORNIA CITY, CA 93504-0298
PO BOX 2299, CALIFORNIA CITY, CA 93504-0299
PO BOX 2300, CALIFORNIA CITY, CA 93504-0300
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