What altitude represents the boundary between Earth's atmosphere and outer space?

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200 km
The Karman line is named after Theodore von Kármán, a Hungarian American engineer and physicist. He was the first person to calculate that the atmosphere around this altitude becomes too thin to support aeronautical flight, since a vehicle would have to travel faster than orbital velocity to derive sufficient aerodynamic lift to support itself.
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Answers by country

100 km
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flagGreece
64%
7%
21%
7%
14
flagthe Netherlands
60%
0%
20%
20%
10
flagMalaysia
46%
7%
15%
30%
13
flagthe United Kingdom
44%
11%
24%
20%
54
flagPoland
43%
12%
30%
13%
1606
flagthe Philippines
41%
8%
25%
25%
12
flagGermany
40%
16%
29%
13%
115
flagIndia
39%
11%
26%
21%
178
flagthe United States
38%
8%
32%
20%
105
flagAustralia
33%
25%
20%
16%
24
flagAustria
31%
13%
44%
10%
29