So an article on The Bestselling Cars in America's Wealthiest Zip Codes concludes the BMW 328 ranks among the most popular. Don't know why this is, maybe just staying on the down low to discourage kidnappers or hijackers or maybe just to discourage the relatives from putting the touch on 'em. In Manhattan zip code 10274, where the average annual income is $5,711,000, is the fourth most popular car, sandwiched between the Accord and CR-V. To slum any lower, they'd probably have to take the bus.