I expect all LAs have their particular circumstances, and there will be some trends, but that's why data helps to give an overall picture. How do people know what happens in their areas if the data and analysis isn't available?
My LA may (or may not) be typical of relatively wealthy London boroughs where many go private, good and outstanding schools are heavily oversubscribed, and the small number of RI schools are undersubscribed. Lots of families move into the area for its schools, but all the expansion options are exhausted and locations for new-builds are non-existent. The language on the council website discourages people from moving in by making it clear how oversubscribed the schools are.
Everyone gets 6 preferences. Many will also be applying to multiple private schools, but the best of those are also oversubscribed. They weigh their private offer(s) against their state offer, and their chances of getting higher preference offers (bearing in mind some of the high attaining state schools do better than some of the privates). So it's messy, and as the LA has an austere target of 0% surplus in all of its schools it manages the situation carefully.
There are always many more state applications than there are places so there are always many families without offers on National Offer Day, by design. They are reassured that places will come available by September, and sure enough they always do. That is because of the waiting list movement. The most oversubscribed private secondary schools require a substantial deposit of the first term's fees in early March (after state offers go out but before they're accepted) so many drop out of the state system at that point and that is when the biggest movement occurs, but there are several waves after that, including a big one in July when the council contacts no-shows for the borough-wide transition day. Movement will continue until early September (when some students don't turn up for their first day).
Looking at the numbers for 2016 here are a few examples of the increases in distance between March and September ..
Outstanding Secondary 1 - increase of 1070m
Outstanding Secondary 2 - increase of 320m
Outstanding Secondary 3 with two catchment areas - increases of 160m and 900m respectively
Good Secondary 1 - increase of 1090m
Good Secondary 2 - increase of 3000m
Secondary Free School (not yet graded) - increase of 1633m
So, apart from anything else, that means awful lot of houses are incorrectly marked as "outside of the successful admissions area for 2016" on a well known property portal. Understandably the council are unlikely to be bothered by that if it discourages more state-school applicants from moving into the area.