The radioreference database depends on local listeners (like you) to submit information when changes like this occur. We have very few talkgroups listed for Greenwood County at this time and none listed for Greenwood PD. If you are in the Greenwood area and have a digital trunk-tracking scanner capable of monitoring the Palmetto P25 system. please use a wildcard (RadioShack/Whistler radios) or ID Search (Uniden radios) to discover active but not yet identified talkgroups on the Greenwood site. I think it's reasonable to assume that any talkgroups you hear i nthe 445xx-449xx range are being used by agencies in Greenwood County.
If you're waiting for the RadioReference database to magically be updated with information for your specific area, you may be missing out on a lot of radio activity.
To submit, use the "Submit" button at the top of any county or Trunked radio system database page on this site. Or post it here to the forums. Part of the fun of the hobby is discovering new information when a change like this occurs.