Former armor crewman here.
As stated, now long out of service and existing only as antiques
M3 Lee
https://en.wikipedia.org/wiki/M3_Lee
- Note: the M3 Grant was the same tank, slightly modified for production purposes. I've read that the habit of naming US tanks after Generals was actually started by the British, after they started receiving them as Lend Lease. The fighting against German panzers in North Africa was going badly for the Commonwealth in 1942 and they needed our vehicles.
M4 Sherman series
M3/M5 Stuart
M10 Jackson (tank destroyer, hull chassis same as the M3 Lee/M4 Sherman VVSS)
M551 Sheridan (out of active service, only in use as a training vehicle visually modified to be various Russian designed Armored Fighting Vehicles)
https://en.wikipedia.org/wiki/M551_Sheridan
M8 Buford (limited production, more experimental than anything operational)
https://en.wikipedia.org/wiki/M8_Armored_Gun_System