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 30003, SALT LAKE CITY, UT 84130-0003
PO BOX 30004, SALT LAKE CITY, UT 84130-0004
PO BOX 30005, SALT LAKE CITY, UT 84130-0005
PO BOX 30006, SALT LAKE CITY, UT 84130-0006
PO BOX 30007, SALT LAKE CITY, UT 84130-0007
PO BOX 30008, SALT LAKE CITY, UT 84130-0008
PO BOX 30009, SALT LAKE CITY, UT 84130-0009
PO BOX 30010, SALT LAKE CITY, UT 84130-0010
PO BOX 30011, SALT LAKE CITY, UT 84130-0011
PO BOX 30012, SALT LAKE CITY, UT 84130-0012
PO BOX 30013, SALT LAKE CITY, UT 84130-0013
PO BOX 30014, SALT LAKE CITY, UT 84130-0014
PO BOX 30015, SALT LAKE CITY, UT 84130-0015
PO BOX 30016, SALT LAKE CITY, UT 84130-0016
PO BOX 30017, SALT LAKE CITY, UT 84130-0017
PO BOX 30018, SALT LAKE CITY, UT 84130-0018
PO BOX 30019, SALT LAKE CITY, UT 84130-0019
PO BOX 30020, SALT LAKE CITY, UT 84130-0020
PO BOX 30021, SALT LAKE CITY, UT 84130-0021
PO BOX 30022, SALT LAKE CITY, UT 84130-0022
PO BOX 30023, SALT LAKE CITY, UT 84130-0023
PO BOX 30024, SALT LAKE CITY, UT 84130-0024
PO BOX 30025, SALT LAKE CITY, UT 84130-0025
PO BOX 30026, SALT LAKE CITY, UT 84130-0026
PO BOX 30027, SALT LAKE CITY, UT 84130-0027
PO BOX 30028, SALT LAKE CITY, UT 84130-0028
PO BOX 30029, SALT LAKE CITY, UT 84130-0029
PO BOX 30030, SALT LAKE CITY, UT 84130-0030
PO BOX 30031, SALT LAKE CITY, UT 84130-0031
PO BOX 30032, SALT LAKE CITY, UT 84130-0032
PO BOX 30033, SALT LAKE CITY, UT 84130-0033
PO BOX 30034, SALT LAKE CITY, UT 84130-0034
PO BOX 30035, SALT LAKE CITY, UT 84130-0035
PO BOX 30036, SALT LAKE CITY, UT 84130-0036
PO BOX 30037, SALT LAKE CITY, UT 84130-0037
PO BOX 30038, SALT LAKE CITY, UT 84130-0038
PO BOX 30039, SALT LAKE CITY, UT 84130-0039
PO BOX 30040, SALT LAKE CITY, UT 84130-0040
PO BOX 30041, SALT LAKE CITY, UT 84130-0041
PO BOX 30042, SALT LAKE CITY, UT 84130-0042
PO BOX 30043, SALT LAKE CITY, UT 84130-0043
PO BOX 30044, SALT LAKE CITY, UT 84130-0044
PO BOX 30045, SALT LAKE CITY, UT 84130-0045
PO BOX 30046, SALT LAKE CITY, UT 84130-0046
PO BOX 30047, SALT LAKE CITY, UT 84130-0047
PO BOX 30048, SALT LAKE CITY, UT 84130-0048
PO BOX 30049, SALT LAKE CITY, UT 84130-0049
PO BOX 30050, SALT LAKE CITY, UT 84130-0050
PO BOX 30051, SALT LAKE CITY, UT 84130-0051
PO BOX 30052, SALT LAKE CITY, UT 84130-0052
PO BOX 30053, SALT LAKE CITY, UT 84130-0053
PO BOX 30054, SALT LAKE CITY, UT 84130-0054
PO BOX 30055, SALT LAKE CITY, UT 84130-0055
PO BOX 30056, SALT LAKE CITY, UT 84130-0056
PO BOX 30057, SALT LAKE CITY, UT 84130-0057
PO BOX 30058, SALT LAKE CITY, UT 84130-0058
PO BOX 30059, SALT LAKE CITY, UT 84130-0059
PO BOX 30060, SALT LAKE CITY, UT 84130-0060
PO BOX 30061, SALT LAKE CITY, UT 84130-0061
PO BOX 30062, SALT LAKE CITY, UT 84130-0062
PO BOX 30063, SALT LAKE CITY, UT 84130-0063
PO BOX 30064, SALT LAKE CITY, UT 84130-0064
PO BOX 30065, SALT LAKE CITY, UT 84130-0065
PO BOX 30066, SALT LAKE CITY, UT 84130-0066
PO BOX 30067, SALT LAKE CITY, UT 84130-0067
PO BOX 30068, SALT LAKE CITY, UT 84130-0068
PO BOX 30069, SALT LAKE CITY, UT 84130-0069
PO BOX 30070, SALT LAKE CITY, UT 84130-0070
PO BOX 30071, SALT LAKE CITY, UT 84130-0071
PO BOX 30072, SALT LAKE CITY, UT 84130-0072
PO BOX 30073, SALT LAKE CITY, UT 84130-0073
PO BOX 30074, SALT LAKE CITY, UT 84130-0074
PO BOX 30075, SALT LAKE CITY, UT 84130-0075
PO BOX 30076, SALT LAKE CITY, UT 84130-0076
PO BOX 30077, SALT LAKE CITY, UT 84130-0077
PO BOX 30078, SALT LAKE CITY, UT 84130-0078
PO BOX 30079, SALT LAKE CITY, UT 84130-0079
PO BOX 30080, SALT LAKE CITY, UT 84130-0080
PO BOX 30081, SALT LAKE CITY, UT 84130-0081
PO BOX 30082, SALT LAKE CITY, UT 84130-0082
PO BOX 30083, SALT LAKE CITY, UT 84130-0083
PO BOX 30084, SALT LAKE CITY, UT 84130-0084
PO BOX 30085, SALT LAKE CITY, UT 84130-0085
PO BOX 30086, SALT LAKE CITY, UT 84130-0086
PO BOX 30087, SALT LAKE CITY, UT 84130-0087
PO BOX 30088, SALT LAKE CITY, UT 84130-0088
PO BOX 30089, SALT LAKE CITY, UT 84130-0089
PO BOX 30090, SALT LAKE CITY, UT 84130-0090
PO BOX 30091, SALT LAKE CITY, UT 84130-0091
PO BOX 30092, SALT LAKE CITY, UT 84130-0092
PO BOX 30093, SALT LAKE CITY, UT 84130-0093
PO BOX 30094, SALT LAKE CITY, UT 84130-0094
PO BOX 30095, SALT LAKE CITY, UT 84130-0095
PO BOX 30096, SALT LAKE CITY, UT 84130-0096
PO BOX 30097, SALT LAKE CITY, UT 84130-0097
PO BOX 30098, SALT LAKE CITY, UT 84130-0098
PO BOX 30099, SALT LAKE CITY, UT 84130-0099
PO BOX 30100, SALT LAKE CITY, UT 84130-0100
PO BOX 30101, SALT LAKE CITY, UT 84130-0101
PO BOX 30102, SALT LAKE CITY, UT 84130-0102
PO BOX 30103, SALT LAKE CITY, UT 84130-0103
PO BOX 30104, SALT LAKE CITY, UT 84130-0104
PO BOX 30105, SALT LAKE CITY, UT 84130-0105
PO BOX 30106, SALT LAKE CITY, UT 84130-0106
PO BOX 30107, SALT LAKE CITY, UT 84130-0107
PO BOX 30108, SALT LAKE CITY, UT 84130-0108
PO BOX 30109, SALT LAKE CITY, UT 84130-0109
PO BOX 30110, SALT LAKE CITY, UT 84130-0110
PO BOX 30111, SALT LAKE CITY, UT 84130-0111
PO BOX 30112, SALT LAKE CITY, UT 84130-0112
PO BOX 30113, SALT LAKE CITY, UT 84130-0113
PO BOX 30114, SALT LAKE CITY, UT 84130-0114
PO BOX 30115, SALT LAKE CITY, UT 84130-0115
PO BOX 30116, SALT LAKE CITY, UT 84130-0116
PO BOX 30117, SALT LAKE CITY, UT 84130-0117
PO BOX 30118, SALT LAKE CITY, UT 84130-0118
PO BOX 30119, SALT LAKE CITY, UT 84130-0119
PO BOX 30120, SALT LAKE CITY, UT 84130-0120
PO BOX 30121, SALT LAKE CITY, UT 84130-0121
PO BOX 30122, SALT LAKE CITY, UT 84130-0122
PO BOX 30123, SALT LAKE CITY, UT 84130-0123
PO BOX 30124, SALT LAKE CITY, UT 84130-0124
PO BOX 30125, SALT LAKE CITY, UT 84130-0125
PO BOX 30126, SALT LAKE CITY, UT 84130-0126
PO BOX 30127, SALT LAKE CITY, UT 84130-0127
PO BOX 30128, SALT LAKE CITY, UT 84130-0128
PO BOX 30129, SALT LAKE CITY, UT 84130-0129
PO BOX 30130, SALT LAKE CITY, UT 84130-0130
PO BOX 30131, SALT LAKE CITY, UT 84130-0131
PO BOX 30132, SALT LAKE CITY, UT 84130-0132
PO BOX 30133, SALT LAKE CITY, UT 84130-0133
PO BOX 30134, SALT LAKE CITY, UT 84130-0134
PO BOX 30135, SALT LAKE CITY, UT 84130-0135
PO BOX 30136, SALT LAKE CITY, UT 84130-0136
PO BOX 30137, SALT LAKE CITY, UT 84130-0137
PO BOX 30138, SALT LAKE CITY, UT 84130-0138
PO BOX 30139, SALT LAKE CITY, UT 84130-0139
PO BOX 30140, SALT LAKE CITY, UT 84130-0140
PO BOX 30141, SALT LAKE CITY, UT 84130-0141
PO BOX 30142, SALT LAKE CITY, UT 84130-0142
PO BOX 30143, SALT LAKE CITY, UT 84130-0143
PO BOX 30144, SALT LAKE CITY, UT 84130-0144
PO BOX 30145, SALT LAKE CITY, UT 84130-0145
PO BOX 30146, SALT LAKE CITY, UT 84130-0146
PO BOX 30147, SALT LAKE CITY, UT 84130-0147
PO BOX 30148, SALT LAKE CITY, UT 84130-0148
PO BOX 30149, SALT LAKE CITY, UT 84130-0149
PO BOX 30150, SALT LAKE CITY, UT 84130-0150
PO BOX 30151, SALT LAKE CITY, UT 84130-0151
PO BOX 30152, SALT LAKE CITY, UT 84130-0152
PO BOX 30153, SALT LAKE CITY, UT 84130-0153
PO BOX 30154, SALT LAKE CITY, UT 84130-0154
PO BOX 30155, SALT LAKE CITY, UT 84130-0155
PO BOX 30156, SALT LAKE CITY, UT 84130-0156
PO BOX 30157, SALT LAKE CITY, UT 84130-0157
PO BOX 30158, SALT LAKE CITY, UT 84130-0158
PO BOX 30159, SALT LAKE CITY, UT 84130-0159
PO BOX 30160, SALT LAKE CITY, UT 84130-0160
PO BOX 30161, SALT LAKE CITY, UT 84130-0161
PO BOX 30162, SALT LAKE CITY, UT 84130-0162
PO BOX 30163, SALT LAKE CITY, UT 84130-0163
PO BOX 30164, SALT LAKE CITY, UT 84130-0164
PO BOX 30165, SALT LAKE CITY, UT 84130-0165
PO BOX 30166, SALT LAKE CITY, UT 84130-0166
PO BOX 30167, SALT LAKE CITY, UT 84130-0167
PO BOX 30168, SALT LAKE CITY, UT 84130-0168
PO BOX 30169, SALT LAKE CITY, UT 84130-0169
PO BOX 30170, SALT LAKE CITY, UT 84130-0170
PO BOX 30171, SALT LAKE CITY, UT 84130-0171
PO BOX 30172, SALT LAKE CITY, UT 84130-0172
PO BOX 30173, SALT LAKE CITY, UT 84130-0173
PO BOX 30174, SALT LAKE CITY, UT 84130-0174
PO BOX 30175, SALT LAKE CITY, UT 84130-0175
PO BOX 30176, SALT LAKE CITY, UT 84130-0176
PO BOX 30177, SALT LAKE CITY, UT 84130-0177
PO BOX 30178, SALT LAKE CITY, UT 84130-0178
PO BOX 30179, SALT LAKE CITY, UT 84130-0179
PO BOX 30180, SALT LAKE CITY, UT 84130-0180
PO BOX 30181, SALT LAKE CITY, UT 84130-0181
PO BOX 30182, SALT LAKE CITY, UT 84130-0182
PO BOX 30183, SALT LAKE CITY, UT 84130-0183
PO BOX 30184, SALT LAKE CITY, UT 84130-0184
PO BOX 30185, SALT LAKE CITY, UT 84130-0185
PO BOX 30186, SALT LAKE CITY, UT 84130-0186
PO BOX 30187, SALT LAKE CITY, UT 84130-0187
PO BOX 30188, SALT LAKE CITY, UT 84130-0188
PO BOX 30189, SALT LAKE CITY, UT 84130-0189
PO BOX 30190, SALT LAKE CITY, UT 84130-0190
PO BOX 30191, SALT LAKE CITY, UT 84130-0191
PO BOX 30192, SALT LAKE CITY, UT 84130-0192
PO BOX 30193, SALT LAKE CITY, UT 84130-0193
PO BOX 30194, SALT LAKE CITY, UT 84130-0194
PO BOX 30195, SALT LAKE CITY, UT 84130-0195
PO BOX 30196, SALT LAKE CITY, UT 84130-0196
PO BOX 30197, SALT LAKE CITY, UT 84130-0197
PO BOX 30198, SALT LAKE CITY, UT 84130-0198
PO BOX 30199, SALT LAKE CITY, UT 84130-0199
PO BOX 30200, SALT LAKE CITY, UT 84130-0200
PO BOX 30201, SALT LAKE CITY, UT 84130-0201
PO BOX 30202, SALT LAKE CITY, UT 84130-0202
PO BOX 30203, SALT LAKE CITY, UT 84130-0203
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