Acronym or AbbreviationDefinition
AKAlaska
ALAlabama
Alt. (alt.)Alternate
ARArkansas
AZArizona
b.born, year born
BCBrethren Church
c.circa - about or around. e.g. "c. 1850" = "Around 1850" 
C.S.A./c.s.aConfederate States of America, "The Confederacy"
CACalifornia
Cert.Certificate
COColorado
COB (CoB)Church of the Brethren
CTConnecticut
d.died, death, deceased, year of death
DCDistrict of Columbia
DEDelaware
E.D. No.Enumeration District Number (United States Census)
e.g.example, for example
FLFlorida
GAGeorgia
GUGuam
HIHawaii
IAIowa
IDIdaho
ILIllinois
INIndiana
KSKansas
KYKentucky
LALouisiana
LCLibrary of Congress
m.married/marriage, year of marriage. Disambiguation: Contextual meaning - when listed in parentheses after a name this will indicate the persons married name, usually a woman's taken name after marriage.
MAMassachusetts
MDMaryland
MEMaine
MIMichigan
MNMinnesota
MOMissouri
MSMississippi
MTMontana
NCNorth Carolina
NDNorth Dakota
NENebraska
NHNew Hampshire
NJNew Jersey
NMNew Mexico
No. (no.)Number
NVNevada
NYNew York
O.Ohio
OGBBOld German Baptist Brethren
OHOhio
OKOklahoma
OROregon
P. (p.)Page
PAPennsylvania
pp.Pages
R.F.D. (RFD)Rural Free Delivery (address)
Reg.Registration
Rev. Revision (Writing), Reverend (Religious Position), contextually dependent.
RIRhode Island
S.D. No.Supervisor's District Number (United States Census)
SCSouth Carolina
SCCSouthern Claims Commission
SDSouth Dakota
TM (TM Database)Tyler Miller
TNTennessee
TXTexas
U.S.United States (of America)
U.S.A.United States of America
UTUtah
VAVirginia
Va.Virginia
vol.Volume (e.g. of a collected work.)
VTVermont
W.Va.West Virginia
WAWashington
WIWisconsin
WVWest Virginia
WYWyoming