So claims the author of this op-ed. From the article:
The truth is that New York, Chicago and most of the older American cities had their greatest growth before there was anything resembling real public planning; the most basic American land planning tool, zoning, did not come into widespread use until the 1920s.
…
Since World War II, moreover, the density of the Los Angeles region has climbed dramatically, while that of older cities in the North and East has plummeted. The result is that today the Los Angeles urbanized area, as reported by the U.S. Census Bureau, has just over 7,000 people per square mile - by a fair margin the densest in the United States.
That 7,000 figure looked a little dubious, so I did some digging at the Census Bureau website.
The first thing we have to question is the use of the term “Los Angeles urbanized area.” For those of you unaware of Census Bureau CSMAs, metropolitan areas typically include many counties beyond the core urban area. The Los Angeles CSMA includes Ventura County, Orange County, Los Angeles County, Riverside County, and San Bernardino County. Of these, Orange County has the highest density, coming in at 3,605.6 people per square mile.
So if you add up each county’s density, you might come to a number near 7,000. However, this is totally erroneous: you’re adding averages. Likewise, adding these numbers and dividing by 5 will also be incorrect as the counties very greatly in square mileage.
Could the “Los Angeles urbanized area” be a small, but heavily built-up portion of Los Angeles County that would indeed have 7,000 people per square mile? Ahh, yes, the central city itself. Now let’s look at his comparisons, Chicago (12,750.3 per sq/mi) and New York (26,402.9 per sq/mi). Just how is Los Angeles “the densest in the United States”? If you’re going to cite a statistic, at least use one that supports your thesis.
I wouldn’t doubt that the sprawl reputation is a bit overblown (especially when you throw places like Houston into the mix), but to say that modern zoning has caused Los Angeles’ density (and the former lack thereof causing NYC’s “sprawl”) is a bit of a stretch.