It depends upon several factors. Each Post Office is assigned to a PO Box fee group. There are 5 groups and the cost depends upon the cost of the building and the value of other buildings around the Post Office.
You may find the price for your local Post Office at http://poboxes.usps.com
The address of the Connecticut Ancestry Society is: Po Box 249, Stamford, CT 06904-0249
The address of the Connecticut Trees Of Honor Memorial is: Po Box 234, Windsor, CT 06095-0234
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The address of the Connecticut Railroad Historical Association Incorporated is: Po Box 255, Canaan, CT 06018-0255
The address of the Federated Garden Clubs Of Connecticut Inc is: Po Box 137, Southport, CT 06890-0137
The address of the Southern Connecticut Ancestry Network Inc is: Po Box 185323, Hamden, CT 06518-0323
The address of the Connecticut Valley Tobacco Historical Society Incorporat is: Po Box 241, Windsor, CT 06095
The address of the Connecticut Electric Railway Association Incorporated is: Po Box 360, East Windsor, CT 06088-0360
The address of the Connecticut Aerospace Hall Of Fame And Museum Inc is: Po Box 1293, Stratford, CT 06615-8761
The address of the Connecticut Antique Machinery Association Inc is: Po Box 1467, New Milford, CT 06776-1467
The address of the Connecticut State Police Academy Alumni Association Muse is: Po Box 1945, Meriden, CT 06450-0899
The address of the Connecticut Eastern Chapt National Railway Historical Societ is: Po Box 665, Willimantic, CT 06226-0665