The entire US population, if living at the density of Brooklyn Ny (35k people/sqmi), would need only the area of New Hampshire to fit. Ryan Advent adds that the whole global population, living at the density of Brooklyn, would be able to fit within the borders of Texas. And if we were willing to get things as tight as Manhattan, the land area of Virginia would serve us just fine.
- Brooklyn density confirmed here, and note that's overall, so many sections of Brooklyn have higher density.
- 1 zip has 80k/sqmi, next has 60k... http://zipatlas.com/us/ny/brooklyn/zip-code-comparison/population-density.htm
- note that 35k people/sqmi = 55 people/acre
- Manhattan NYC density: 68k/sqmi
- The New York State Assembly Tenement House Committee report of 1894 surveyed 8,000 buildings with approximately 255,000 residents and found New York to be the most densely populated city in the world, at an average of 143 people per acre, with part of the Lower East Side having 800 residents per acre, denser than Bombay.
- Queens NYC: 20k/sqmi (the Rego Park/Forest Hills area has 41k/sqmi https://wagner.nyu.edu/files/faculty/publications/NYUFurmanCenter_SOC2014_HighRes.pdf
- This list shows 14 places with density over 20k/sqmi (3 of which have pop under 10k) (10 of the 14 are NYC-areas), a total list of 125 with density over 10k/sqmi (17 of which have pop over 100k)
- San Francisco: 16k/sqmi (though 4 zip codes have over 40k/sqmi; pop 0.837M
- Silicon Valley?
- Oak Land: 7k/sqmi (pop 0.4M) (Alameda County) (KaiserPermanante has 13k empl)
- Santa Clara County: 1k/sqmi (pop 1.8M)
- San Jose: 5k/sqmi (pop 1M) (Cisco HQ has 16k empl)
- Sunny Vale: 6.2k/sqmi (pop 0.1M)
- Redwood City: 4.0k/sqmi (pop 0.077M) (Oracle HQ has 8k empl)
- Mountain View: 6.0k/sqmi (pop 0.075M) (Google HQ has ~18k employees)
- Cupertino: 5.2k/sqmi (pop 0.058M) (Apple HQ has 12k empl)
- Menlo Park: 3.3k/sqmi (pop 0.032M) (FaceBook HQ has ~2k empl)
- Stanford: 5.0k/sqmi (pop 0.014M) (Stanford University has 11k empl, Stanford Hospital has 8k empl))
- Los Angeles: 8.3k/sqmi (pop 3.9M)
- Chicago: 11k/sqmi (pop 2.7M)
Does not require all-SkyScraper environment. Julie Campoli and Alex MacLean’s book Visualizing Density vividly illustrates that we can achieve tremendous density without high-rises. They point out that before elevators were invented, two- to four- story "walk-ups" were common in cities and towns throughout America. Constructing a block of these type of buildings could achieve a density of anywhere from 20 to 80 units an acre. Mid-rise buildings ranging from 5 to 12 stories can create even higher density neighborhoods in urban settings, where buildings cover most of the block. Campoli and MacLean point to Seattle where mid-rise buildings achieve densities ranging from 50 to 100 units per acre, extraordinarily high by U.S. standards.
see Traditional City
- Nathan Lewis says: Using the 100,000 people per square mile of some of Paris' residential districts (in the Traditional City style of buildings generally no higher than six stories)....
FiveThirtyEight looked at decided, based on surveys, that a ZipCode/ZCTA density of 2.2k households/sqmi (if avg 2.5 ppl/hh then that's 5.5k people/sqmi) qualified as "urban". (And looked at what portion of various cities are urban.)
SplitWise provides a nice spreadsheet. 33,144 zips covering 308.4M people. 298 zips with 0 people!
- I sorted by density:
- the 1st 2 are tiny pieces of WashingtonDC, with less than 1k ppl each.
- if I used 5500 ppl/sqmi as "urban" (per 538 above), that would be 1634 zips (5%) covering 49.6M (16% of population)
- if I used 246.72M (80%) as the population cut-off, it would need 13,242 zips (40%).
- I sorted by population:
- if I use 246.72 (80%) as the population cut-off, it would need 8759 zips (26%). The population of the zip at the margin is 11,581
- if I combine threshholds and look at zips with pop>11,581 and density>5500, there are 1302 zips (4%), covering 48.1M (15%)