Enter two of the most powerful ignorance-dispelling mechanisms ever invented by mankind:
"Communities" tab? (Note that there's a format change scheduled and this organizational feature may not persist into the future).
Answer: Because those sixteen really do appear to represent about 95% of the county's entire population. This wasn't obvious to me. I think of Galveston County and I visualize all this open land, and I intuitively conclude that there must be a fair number of folks diffused all over the place in rural areas, old homesteads, farms, ranchettes, etc. that are geographically independent and outside of defined communities. But that's actually not so much the case.
Anyway, for future reference, here's what I derived using the aforementioned powerful ignorance-dispelling mechanisms.
But we must also have the picture that tells the proverbial thousand words:
|Same sixteen communities listed by Galveston County Daily News, but arranged clockwise in order of descending population per the referenced data sources. GCDN arranges them alphabetically instead (at least they did as of November 2012). This pie chart exhibits a few rounding differences but is based on the table presented above.|