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 1641, WATERBURY, CT 06721-1641
PO BOX 1642, WATERBURY, CT 06721-1642
PO BOX 1643, WATERBURY, CT 06721-1643
PO BOX 1644, WATERBURY, CT 06721-1644
PO BOX 1645, WATERBURY, CT 06721-1645
PO BOX 1646, WATERBURY, CT 06721-1646
PO BOX 1647, WATERBURY, CT 06721-1647
PO BOX 1648, WATERBURY, CT 06721-1648
PO BOX 1649, WATERBURY, CT 06721-1649
PO BOX 1650, WATERBURY, CT 06721-1650
PO BOX 1651, WATERBURY, CT 06721-1651
PO BOX 1652, WATERBURY, CT 06721-1652
PO BOX 1653, WATERBURY, CT 06721-1653
PO BOX 1654, WATERBURY, CT 06721-1654
PO BOX 1655, WATERBURY, CT 06721-1655
PO BOX 1656, WATERBURY, CT 06721-1656
PO BOX 1657, WATERBURY, CT 06721-1657
PO BOX 1658, WATERBURY, CT 06721-1658
PO BOX 1659, WATERBURY, CT 06721-1659
PO BOX 1660, WATERBURY, CT 06721-1660
PO BOX 1661, WATERBURY, CT 06721-1661
PO BOX 1662, WATERBURY, CT 06721-1662
PO BOX 1663, WATERBURY, CT 06721-1663
PO BOX 1664, WATERBURY, CT 06721-1664
PO BOX 1665, WATERBURY, CT 06721-1665
PO BOX 1666, WATERBURY, CT 06721-1666
PO BOX 1667, WATERBURY, CT 06721-1667
PO BOX 1668, WATERBURY, CT 06721-1668
PO BOX 1669, WATERBURY, CT 06721-1669
PO BOX 1670, WATERBURY, CT 06721-1670
PO BOX 1671, WATERBURY, CT 06721-1671
PO BOX 1672, WATERBURY, CT 06721-1672
PO BOX 1673, WATERBURY, CT 06721-1673
PO BOX 1674, WATERBURY, CT 06721-1674
PO BOX 1675, WATERBURY, CT 06721-1675
PO BOX 1676, WATERBURY, CT 06721-1676
PO BOX 1677, WATERBURY, CT 06721-1677
PO BOX 1678, WATERBURY, CT 06721-1678
PO BOX 1679, WATERBURY, CT 06721-1679
PO BOX 1680, WATERBURY, CT 06721-1680
PO BOX 1681, WATERBURY, CT 06721-1681
PO BOX 1682, WATERBURY, CT 06721-1682
PO BOX 1683, WATERBURY, CT 06721-1683
PO BOX 1684, WATERBURY, CT 06721-1684
PO BOX 1685, WATERBURY, CT 06721-1685
PO BOX 1686, WATERBURY, CT 06721-1686
PO BOX 1687, WATERBURY, CT 06721-1687
PO BOX 1688, WATERBURY, CT 06721-1688
PO BOX 1689, WATERBURY, CT 06721-1689
PO BOX 1690, WATERBURY, CT 06721-1690
PO BOX 1691, WATERBURY, CT 06721-1691
PO BOX 1692, WATERBURY, CT 06721-1692
PO BOX 1693, WATERBURY, CT 06721-1693
PO BOX 1694, WATERBURY, CT 06721-1694
PO BOX 1695, WATERBURY, CT 06721-1695
PO BOX 1696, WATERBURY, CT 06721-1696
PO BOX 1697, WATERBURY, CT 06721-1697
PO BOX 1698, WATERBURY, CT 06721-1698
PO BOX 1699, WATERBURY, CT 06721-1699
PO BOX 1700, WATERBURY, CT 06721-1700
PO BOX 1701, WATERBURY, CT 06721-1701
PO BOX 1702, WATERBURY, CT 06721-1702
PO BOX 1703, WATERBURY, CT 06721-1703
PO BOX 1704, WATERBURY, CT 06721-1704
PO BOX 1705, WATERBURY, CT 06721-1705
PO BOX 1706, WATERBURY, CT 06721-1706
PO BOX 1707, WATERBURY, CT 06721-1707
PO BOX 1708, WATERBURY, CT 06721-1708
PO BOX 1709, WATERBURY, CT 06721-1709
PO BOX 1710, WATERBURY, CT 06721-1710
PO BOX 1711, WATERBURY, CT 06721-1711
PO BOX 1712, WATERBURY, CT 06721-1712
PO BOX 1713, WATERBURY, CT 06721-1713
PO BOX 1714, WATERBURY, CT 06721-1714
PO BOX 1715, WATERBURY, CT 06721-1715
PO BOX 1716, WATERBURY, CT 06721-1716
PO BOX 1717, WATERBURY, CT 06721-1717
PO BOX 1718, WATERBURY, CT 06721-1718
PO BOX 1719, WATERBURY, CT 06721-1719
PO BOX 1720, WATERBURY, CT 06721-1720
PO BOX 1721, WATERBURY, CT 06721-1721
PO BOX 1722, WATERBURY, CT 06721-1722
PO BOX 1723, WATERBURY, CT 06721-1723
PO BOX 1724, WATERBURY, CT 06721-1724
PO BOX 1725, WATERBURY, CT 06721-1725
PO BOX 1726, WATERBURY, CT 06721-1726
PO BOX 1727, WATERBURY, CT 06721-1727
PO BOX 1728, WATERBURY, CT 06721-1728
PO BOX 1729, WATERBURY, CT 06721-1729
PO BOX 1730, WATERBURY, CT 06721-1730
PO BOX 1731, WATERBURY, CT 06721-1731
PO BOX 1732, WATERBURY, CT 06721-1732
PO BOX 1733, WATERBURY, CT 06721-1733
PO BOX 1734, WATERBURY, CT 06721-1734
PO BOX 1735, WATERBURY, CT 06721-1735
PO BOX 1736, WATERBURY, CT 06721-1736
PO BOX 1737, WATERBURY, CT 06721-1737
PO BOX 1738, WATERBURY, CT 06721-1738
PO BOX 1739, WATERBURY, CT 06721-1739
PO BOX 1740, WATERBURY, CT 06721-1740
PO BOX 1741, WATERBURY, CT 06721-1741
PO BOX 1742, WATERBURY, CT 06721-1742
PO BOX 1743, WATERBURY, CT 06721-1743
PO BOX 1744, WATERBURY, CT 06721-1744
PO BOX 1745, WATERBURY, CT 06721-1745
PO BOX 1746, WATERBURY, CT 06721-1746
PO BOX 1747, WATERBURY, CT 06721-1747
PO BOX 1748, WATERBURY, CT 06721-1748
PO BOX 1749, WATERBURY, CT 06721-1749
PO BOX 1750, WATERBURY, CT 06721-1750
PO BOX 1751, WATERBURY, CT 06721-1751
PO BOX 1752, WATERBURY, CT 06721-1752
PO BOX 1753, WATERBURY, CT 06721-1753
PO BOX 1754, WATERBURY, CT 06721-1754
PO BOX 1755, WATERBURY, CT 06721-1755
PO BOX 1756, WATERBURY, CT 06721-1756
PO BOX 1757, WATERBURY, CT 06721-1757
PO BOX 1758, WATERBURY, CT 06721-1758
PO BOX 1759, WATERBURY, CT 06721-1759
PO BOX 1760, WATERBURY, CT 06721-1760
PO BOX 1761, WATERBURY, CT 06721-1761
PO BOX 1762, WATERBURY, CT 06721-1762
PO BOX 1763, WATERBURY, CT 06721-1763
PO BOX 1764, WATERBURY, CT 06721-1764
PO BOX 1765, WATERBURY, CT 06721-1765
PO BOX 1766, WATERBURY, CT 06721-1766
PO BOX 1767, WATERBURY, CT 06721-1767
PO BOX 1768, WATERBURY, CT 06721-1768
PO BOX 1769, WATERBURY, CT 06721-1769
PO BOX 1770, WATERBURY, CT 06721-1770
PO BOX 1771, WATERBURY, CT 06721-1771
PO BOX 1772, WATERBURY, CT 06721-1772
PO BOX 1773, WATERBURY, CT 06721-1773
PO BOX 1774, WATERBURY, CT 06721-1774
PO BOX 1775, WATERBURY, CT 06721-1775
PO BOX 1776, WATERBURY, CT 06721-1776
PO BOX 1777, WATERBURY, CT 06721-1777
PO BOX 1778, WATERBURY, CT 06721-1778
PO BOX 1779, WATERBURY, CT 06721-1779
PO BOX 1780, WATERBURY, CT 06721-1780
PO BOX 1781, WATERBURY, CT 06721-1781
PO BOX 1782, WATERBURY, CT 06721-1782
PO BOX 1783, WATERBURY, CT 06721-1783
PO BOX 1784, WATERBURY, CT 06721-1784
PO BOX 1785, WATERBURY, CT 06721-1785
PO BOX 1786, WATERBURY, CT 06721-1786
PO BOX 1787, WATERBURY, CT 06721-1787
PO BOX 1788, WATERBURY, CT 06721-1788
PO BOX 1789, WATERBURY, CT 06721-1789
PO BOX 1790, WATERBURY, CT 06721-1790
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