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It looks like the data here is really that from Clark County and not for the MSA. I tried to locate the actual data but the census site really fights you all the way. So if someone can find accurate data on population change please update this and link to the sources. Also, it would be nice to locate the historical definitions for the area. Vegaswikian (talk) 06:06, 23 June 2012 (UTC)
I wouldn't worry about it too much. The population of the neighboring counties is pretty tiny, and really insignificant compared to Clark. I'd say it's fine as it is as long as you specifically note that it's the Clark County population. D O N D E groovilyTalk to me 15:54, 23 June 2012 (UTC)