OK, name them.
I get the following:
Conservative Calvinist
OPC
PCA
ARP
RPCNA
K-APC
Conservative, Non-Calvinist
BPC
Moderate
EPC
KPCA
EAPCA
Liberal/NonCalvinist
PC(USA)
Cumberland Presbyterian
Cumberland Pres in America
And the offshoot of the PCUSA
ECO
>> OK, name them <<
For the time being, the best I can do is 32:
American Presbyterian Church (founded 1979)
Associate Reformed Presbyterian Church
Bible Presbyterian Church
Christian Presbyterian Church
Covenant Presbyterian Church
Cumberland Presbyterian Church
Cumberland Presbyterian Church in America
ECO (denomination)
Evangelical Assembly of Presbyterian Churches in America
Evangelical Presbyterian Church (established 1956)
Evangelical Presbyterian Church (United States)
Evangelical Reformed Presbyterian Church
Free Church of Scotland (Continuing)
Free Presbyterian Church of North America
Free Presbyterian Church Synod of the United States
Korean American Presbyterian Church
Korean Presbyterian Church in America
Orthodox Presbyterian Church
Presbyterian Church (U.S.A.)
Presbyterian Church in America
Presbyterian Church in the United States
Presbyterian Church in the United States of America
Presbyterian Reformed Church (North America)
Reformed Presbyterian Church – Hanover Presbytery
Reformed Presbyterian Church General Assembly
Reformed Presbyterian Church in the United States
Reformed Presbyterian Church of North America
Reformed Presbyterian Church, Evangelical Synod
United Presbyterian Church in the United States of America
United Presbyterian Church of North America
Upper Cumberland Presbyterian Church
Westminster Presbyterian Church in the United States
I’d move the PCA and ARP down to moderate. I’d add RPCNA to the conservative group. There are some microdenominations around the country, but I don’t count them if they have fewer members than one of the big five PCA congregations.