This is a partial listing, and is a work-in-progress!
Suffix City/Town/District
AS – Ansonia
AV – Avon
BA – Barkhamstead
BD – Bloomfield
BE – Berlin
BF – Beacon Falls
BK – Brookfield
BPT – Bridgeport
BR – Branford
BT – Bristol
BW – Bridgewater
CH – Cheshire
CL – Clinton
CN – Canton
CO – Colchester
CW – Cromwell
DA – Danbury
DAR – Darien
DE – Derby
DR – Deep River
DU – Durham
EH – East Hartford
EHA – East Haven
ENF – Enfield
EM – East Hampton
ES – Essex
FA – Fairfield
FN – Farmington
FWD – Farmington Woods District
GL – Glastonbury
GO – Goshen
GRO – Groton
GU – Guilford
HE – Hebron
HFD – Hartford
HN – Hamden
KW – Killingworth
LI – Lisbon
MA – Manchester
MDC – Metropolitan District
MDF – Middlefield
MDN – Madison
ME – Meriden
MFD – Milford
MN – Middletown
MO – Marlborough
MON – Monroe
NB – New Britain
NBR – North Branford
NDV – ?
NE – Newington
NF – New Fairfield
NFK – Norfolk
NH – New Haven
NHD – New Hartford
NHN – North Haven
NM – New Milford
NW – Norwalk
NWT – Second Taxing District of City of Norwalk (South Norwalk Electric and Water)
OS – Old Saybrook
PL – Plainville
PO – Portland
PT – Putnam
PY – Plymouth
RH – Rocky Hill
RPV – Regional refuse district #1
SBY – Southbury
SE – Seymour
SF – Stratford
SH – Shelton
SI – Simsbury
SO – Southington
ST – Stamford
STF – Stafford
STN – Stonington
SU – Suffield
SW – South Windsor
TH – Thomaston
TO – Torrington
TR – Trumbull
WB – Westbrook
WF – Wallingford
WBY – Waterbury
WFD – Waterford
WH – West Hartford
WIN – Windsor
WL – Windsor Locks
WN – West Haven
WOO – Woodbridge
WP – Westport
WR – Winchester/Winsted
WT – Watertown
WTD – Wethersfield