Google SubdomainsFollowing is a list of 40 most popular subdomains of google.com in terms of unique visitors. If traffic is any measure of popularity, this chart definitely provides some good hints about the relative popularity of various Google services.

For instance, Google Answers service is no longer active but the archive Q&A’s continue to get more traffic that Google Blogs search and even Google Sites, a wiki like service that will soon replace Google Pages.

Google’s experiment with hosted news seems to be paying off as is evident from the traffic on domains ap.google.com and afp.google.com.

*This data is from Compete for the month of November 2008 and counts only unique visitors.

Top 40 Google Subdomains

Rank Subdomain Description Unique Visitors
1 www.google.com Web Search 126,269,804
2 images.google.com Image Search 43,023,240
3 maps.google.com Google Maps 36,914,680
4 mail.google.com Gmail Google Mail 24,895,354
5 news.google.com Google News 13,356,758
6 video.google.com Google Video 10,204,587
7 books.google.com Google Books 7,927,748
8 clients1.google.com   6,706,051
9 picasaweb.google.com Picasa Web Albums 5,298,616
10 groups.google.com Google Groups 4,635,581
11 suggestqueries.google.com Google Suggest 3,474,637
12 docs.google.com Google Docs 3,350,849
13 translate.google.com Google Translate 2,894,445
14 earth.google.com Google Earth 2,569,757
15 spreadsheets.google.com Google Spreadsheets 2,528,648
16 scholar.google.com Google Scholar 1,959,375
17 ap.google.com Associated Press 1,889,635
18 finance.google.com Google Finance 1,858,152
19 toolbar.google.com Google Toolbar 1,767,647
20 partnerpage.google.com Google Start Page 1,764,685
21 video-stats.video.google.com   1,623,872
22 pack.google.com Google Pack 1,507,250
23 adwords.google.com Google AdWords 1,412,911
24 answers.google.com Google Answers 1,277,980
25 checkout.google.com Google Checkout 1,239,261
26 sites.google.com Google Sites 1,237,010
27 blogsearch.google.com Google Blog Search 1,229,263
28 code.google.com Hosted Code Libraries 1,049,731
29 picasa.google.com Picasa Software 978,392
30 dl.google.com Google Downloads 973,467
31 feedproxy.google.com FeedBurner 959,884
32 desktop.google.com Google Desktop Search 951,090
33 services.google.com   635,560
34 talkgadget.google.com Googel Talk Gadget 506,306
35 fusion.google.com Google IG Subscribe 496,913
36 clients.google.com   470,176
37 gmail.google.com Gmail 443,869
38 l.google.com   431,403
39 afp.google.com Agence France Presse 412,095
40 sketchup.google.com Google Sketchup 411,761

Some of the popular Google properties missing in the list are Blogger.com, Orkut, Google Apps for Domains, Google Reader, Google Calendar, Google AdSense (googlesyndication.com), Google Notebook, Google Analytics, Google Base and YouTube.com since they are not Google subdomains.

Google services that are on subdomains but seem to missing from the top 40 list include Google Knol, Google Directory, Google Labs and Google Local.

Also see: Google Docs users spend just 5 minutes