Are there any web sites that provide info on colt pistols with more recen (after 1980) serial numbers?

No.  The only online site stops at 1979:
proofhouse.com/colt/

The only later source of info is in RL Wilson's book "Colt An American Legend"
In the back of the book are ALL known serial number ranges for ALL Colt firearms made from 1836 to the publishing date in 1985.

For any Colt made after 1985 the only source of info is Colt.
If you call the factory during business hours, they will give you a production date over the phone, but NO other info.

Thank you.

Quoted: No.  The only online site stops at 1979: proofhouse.com/colt/ The only later source of info is in RL Wilson's book "Colt An American Legend" In the back of the book are ALL known serial number ranges for ALL Colt firearms made from 1836 to the publishing date in 1985. For any Colt made after 1985 the only source of info is Colt. If you call the factory during business hours, they will give you a production date over the phone, but NO other info.