The one over Russia was the size of a motorhome, roughly. The Asteroid that passed between the GPS satellites and the weather and communication satellites was about the size of a ten story building. The Tongusca object was estimated to be about the size of an old VW Beetle. The Chicxulub object was the size of a medium sized town.
That said, Russia is a bit like Montana. It's vast, with localized pockets of population, except on the western quarter or so. If this had happened over a major metropolis, we wouldn't be having casual discussions; we would be sending aid.