Regarding the presentation of four-digit numbers, I doubt we have a policy for it. Some official style guides will insert a comma (e.g., 1,764), others say not to bother (e.g., 1764). Both are generally common and acceptable. I prefer the latter for habit and personal taste, but it's no biggie. Five-digit numbers and higher generally have commas included.
If in doubt, we could follow the Wikipedia Manual of Style. Which says both styles are fine for four-digit numbers, unless they're years in which case they don't get commas, and commas are included in all larger numbers. — BadCatMan (talk) 03:14, June 8, 2013 (UTC)