About 500 miles. Still in the same state, though.
299.37 miles (5 hours 11 minutes) from my current address in Kansas City MO to the only hospital address I could find in Greensburg KS. Not sure it’s the exact one where I was born.
According to Mapquest, my house is 10.41 miles away from the hospital where I was born.
6.63 miles
Using this nifty site, the distance between where I was born - Castro Valley, California, United States - and where I live now - Nottingham, England, United Kingdom - is as the crow flies: 5258 miles (8462 km) (4569 nautical miles) apart.
Initial heading from Castro Valley to Nottingham: north-northeast (32.2 degrees)
Initial heading from Nottingham to Castro Valley: northwest (315.6 degrees)
However, I think the fly miles are more… 
OK, time for a fresh update:
125 respondents (thanks, everyone!)
31% of respondents live within 100 miles of their birthplace
22% live between 100 and 1000 miles away
47% live more than 1000 miles away from their birthplace
mean distance was 1615 miles
median distance was 599.1 miles
top 5 shortest
sassy; 0.21
cunctator; 0.447
queen tonya; 0.7
Hirundo82; 0.83
ashes, ashes; 1
top 5 longest
mamatiger; 9581
Giles; 9469
Jervoise; 8998
false god; 8540 Nautical Miles
TroubleAgain; 7309
closest to mean: look@hergo!; 1643.7
median: twickster; 599.1
since this is IMHO (thanks, CajunMan!), I reserve the right to rank false god’s answer below the others for the following reasons:
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I have no way of knowing what kind of measurement was used by each poster. For all I know, the other long-distance posters used nautical miles and just didn’t say.
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This thread is in IMHO and I am the OP. Feel free to compile your own statistical analysis of the posts herein.
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Oops, gotta go. My TV show is starting!
I live 10685 km from my home. Beijing to Wayne, MI.
According to Mapquest, it’s 595 miles and 9 hours, 53 minutes from here to the hospital where I was born. I’m happy calling it 600 miles and 10 hours (unless I take the route they suggest–with all the wrecks and construction on 40, it tends to turn into 11 or 12 hours.)
I am 3075 miles from my birthplace in Brookings, S. Dak.
Well, I checked my math again and came up with the following:
9426 miles (15169 km) (8191 nautical miles)
Initial heading from San Clemente to Colombo:
north-northwest (334.6 degrees)
Initial heading from Colombo to San Clemente:
north-northeast (21.2 degrees)
San Clemente, California, US
County: Orange County
Location: 33:26:50N 117:36:40W
Population (1990): 41100
Elevation: 160 feet
Colombo, Sri Lanka
Location: 6:58:00N 79:52:00E
From St Luke’s Hospital in Cleveland to Lexington, KY: 341.7 miles.
But most of adulthood was at least 1000 miles further away.
Born in Boston, living in Tokyo.
6710 miles, 10798 km
Twelve parsecs.
Or, from where I first landed on your planet to where I am now, 475 miles.
;j
And my wife would like to weigh in with 9,720 from Pensacola, FL, to Colombo, Sri Lanka. Added to my 9,426, I think we win, folks.
I live 1300 miles (give or take a few) from my birthplace.
:::YAY!! 400th post… shutting up now:::
Leiden - Pittsburgh 3883 Mi.
55 miles or there abouts.
I had to calculate it to the town since the hospital hasn’t existed for more than 20 years, and I have no idea what part of town it was in. I find it odd, however, that the farthest I’ve lived from that town was while living in the same state as the former hospital.
About 300 kilometres.