How Many Keywords Is Too Many?

[Mech]

have a business which offer services in multiple areas (ie: 10 cities/towns). In addition to my priority keywords related to the service (ie: service 1, service 2), I am planning to include the 10 target cities/towns in my keyword list. My draft list currently contains about 20 keywords. Is this list too long? I would appreciate any suggestions regarding the number of keywords and any keyword strategy considerations to rank well for this scenario (ie: service 1 city 1, service 2 city 1, service 1 city 2, service 2 city 2, etc.).

[Marchant]

The only limit to the number of keywords is the amount of content (number of pages) you have on your site.

Figure about 3 or so phrases per page. But be careful of just creating junk pages so you can add more keywords.

[gregsashinsky]

Some sites say Keywords are unnecessar, other say no more than 100 characters worth, others 200, other 1000 characters worth. What are the consequences of too many characters of keywords from the robot and spider point of view – do they count the number of characters first then if there’s too many they don’t read the keywords at all!

[cromartie]

I just repeat what Matt Cutts, Google Search Engineer always say and that's: keep it logical for the visitor.