Adelaide.
Well, somethings terminating Google.com HTTP in South Australia; from my Internode ADSL:
Tracing route to www.l.google.com [150.101.98.216]
over a maximum of 30 hops:
1 <1 ms <1 ms 1 ms my.router [192.168.1.1]
2 20 ms 18 ms 18 ms lns5.mel4.internode.on.net [150.101.212.93]
3 27 ms 27 ms 28 ms vl13.cor3.mel4.internode.on.net [150.101.212.14]
4 28 ms 28 ms 27 ms pos3-0.bdr2.adl2.internode.on.net [203.16.212.129]
5 27 ms 28 ms 28 ms po2.cor3.adl2.internode.on.net [203.16.212.155]
6 27 ms 27 ms 27 ms g216.internode.on.net [150.101.98.216]
This isn't evidence of a data center in SA, necessarily speaking, and oddly enough from an AAPT/Connect.com connection in Melbourne we do indeed go to the US:
$ traceroute -S 3 www.google.com.au
traceroute to www.l.google.com (72.14.253.99), 64 hops max, 40 byte packets
3 atm4-0-8.cor4.bur.connect.com.au (210.11.171.30) [AS2764] 157.240 ms 249.243 ms 295.130 ms
4 ge-0-1-1.dst1.bur.connect.com.au (210.8.107.193) [AS2764] 6.640 ms 6.727 ms 7.077 ms
5 so-4-0-0.cre1.mel.connect.com.au (202.10.0.139) [AS2764] 21.682 ms 7.520 ms 6.727 ms
6 as0.cre1.bur.connect.com.au (202.10.0.65) [AS2764] [MPLS: Label 103264 Exp 1] 7.947 ms 8.370 ms 7.730 ms
7 so-5-1-0.cre1.hay.connect.com.au (202.10.0.250) [AS2764] 20.797 ms 21.276 ms 22.130 ms
8 so-1-0-0.bdr5.syd.connect.com.au (202.10.4.92) [AS2764/AS1221] 29.717 ms 21.799 ms 21.727 ms
9 so1-0-0.sybr4.global-gateway.net.nz (203.96.120.121) [AS9901] 21.095 ms 25.513 ms 22.625 ms
10 * * *
11 * * *
12 * * *
13 209.85.130.2 (209.85.130.2) [AS15169] 187.466 ms 191.343 ms 195.544 ms
14 216.239.49.198 (216.239.49.198) [AS15169] [MPLS: Label 449927 Exp 4] 207.420 ms 66.249.95.135 (66.249.95.135) [AS15169] [MPLS: Label 764124 Exp 4] 194.304 ms 216.239.49.198 (216.239.49.198) [AS15169] [MPLS: Label 491383 Exp 4] 196.383 ms
15 216.239.48.32 (216.239.48.32) [AS15169] 195.796 ms (TOS=128!) 72.14.236.164 (72.14.236.164) [AS15169] [MPLS: Label 643948 Exp 4] 189.918 ms (TOS=0!) 195.034 ms
16 64.233.174.99 (64.233.174.99) [AS15169] 196.809 ms (TOS=128!) 64.233.174.97 (64.233.174.97) [AS15169] 199.066 ms 64.233.174.103 (64.233.174.103) [AS15169] 197.451 ms
17 209.85.251.129 (209.85.251.129) [AS15169] 199.799 ms 64.233.174.97 (64.233.174.97) [AS15169] 202.251 ms 64.233.174.99 (64.233.174.99) [AS15169] 194.406 ms
18 74.125.30.46 (74.125.30.46) [AS15169] 194.484 ms (TOS=0!) 74.125.31.174 (74.125.31.174) [AS15169] 199.816 ms 74.125.30.174 (74.125.30.174) [AS15169] 204.417 ms
19 po-in-f99.google.com (72.14.253.99) [AS15169] 199.225 ms 198.853 ms 231.052 ms