Comscore Rankings 2009

At the start of 2009, the following 50 companies lead the pack:

Comscore released the following data on the top 50 web properties, in the US Market, for December 2008:

Top 50 Web Properties at the start of 2009:

1 Google Sites
2 Yahoo! Sites
3 Microsoft Sites
4 AOL LLC
5 Fox Interactive Media
6 eBay
7 Ask Network
8 Amazon Sites
9 Glam Media
10 Wikimedia Foundation Sites
11 FACEBOOK.COM
12 Apple Inc.
13 CBS Corporation
14 Wal-Mart
15 Turner Network
16 Viacom Digital
17 New York Times Digital
18 Target Corporation
19 Weather Channel, The
20 craigslist, inc.
21 AT&T Interactive Network
22 Adobe Sites
23 Time Warner - Excluding AOL
24 Verizon Communications Corporation
25 Comcast Corporation
26 Disney Online
27 Shopzilla.com Sites
28 Superpages.com Network
29 AT&T, Inc.
30 Best Buy Sites
31 Bank of America
32 Sears Sites
33 Weatherbug Property
34 Everyday Health
35 United Online, Inc
36 Gorilla Nation
37 WordPress
38 Demand Media
39 Photobucket.com LLC
40 Answers.com Sites
41 Real.com Network
42 JCPenney Sites
43 JPMorgan Chase Property
44 UPS Sites
45 The Mozilla Organization
46 WhitePages
47 Gannett Sites
48 iVillage.com: The Womens Network
49 WorldNow - ABC Owned Sites
50 ESPN

Quantcast.com, a competitor to comScore, also releases the top 200 web properties in the US market.  Here is the Quantcast rankings for January 2009:

Top 200 Websites in the United States, January 2009

1 - google.com , 140M+ U.S. monthly people
2 - yahoo.com , 126M+ U.S. monthly people
3 - msn.com , 106M+ U.S. monthly people
4 - live.com , 99M+ U.S. monthly people
5 - youtube.com , 78M+ U.S. monthly people
6 - wikipedia.org , 77M+ U.S. monthly people
7 - microsoft.com , 76M+ U.S. monthly people
8 - myspace.com , 68M+ U.S. monthly people
9 - facebook.com , 66M+ U.S. monthly people
10 - ebay.com , 65M+ U.S. monthly people
11 - aol.com , 64M+ U.S. monthly people
12 - amazon.com , 56M+ U.S. monthly people
13 - about.com , 47M+ U.S. monthly people
14 - craigslist.org , 45M+ U.S. monthly people
15 - blogspot.com , 44M+ U.S. monthly people
16 - ask.com , 41M+ U.S. monthly people
17 - answers.com , 40M+ U.S. monthly people
18 - mapquest.com , 39M+ U.S. monthly people
19 - photobucket.com , 35M+ U.S. monthly people
20 - go.com , 34M+ U.S. monthly people
21 - adobe.com , 33M+ U.S. monthly people
22 - windows.com , 32M+ U.S. monthly people
23 - walmart.com , 31M+ U.S. monthly people
24 - usatoday.com , 29M+ U.S. monthly people
25 - wordpress.com , 28M+ U.S. monthly people
26 - paypal.com , 28M+ U.S. monthly people
27 - cnn.com , 27M+ U.S. monthly people
28 - reference.com , 26M+ U.S. monthly people
29 - imdb.com , 25M+ U.S. monthly people
30 - flickr.com , 24M+ U.S. monthly people
31 - att.com , 23M+ U.S. monthly people
32 - blogger.com , 22M+ U.S. monthly people
33 - target.com , 22M+ U.S. monthly people
34 - comcast.net , 22M+ U.S. monthly people
35 - yellowpages.com , 22M+ U.S. monthly people
36 - apple.com , 21M+ U.S. monthly people
37 - bizrate.com , 21M+ U.S. monthly people
38 - ehow.com , 21M+ U.S. monthly people
39 - geocities.com , 20M+ U.S. monthly people
40 - webmd.com , 20M+ U.S. monthly people
41 - weather.com , 18M+ U.S. monthly people
42 - bankofamerica.com , 18M+ U.S. monthly people
43 - nextag.com , 18M+ U.S. monthly people
44 - careerbuilder.com , 16M+ U.S. monthly people
45 - whitepages.com , 16M+ U.S. monthly people
46 - irs.gov , 16M+ U.S. monthly people
47 - zynga.com , 15M+ U.S. monthly people
48 - bestbuy.com , 15M+ U.S. monthly people
49 - download.com , 15M+ U.S. monthly people
50 - merriam-webster.com , 15M+ U.S. monthly people
51 - chase.com , 15M+ U.S. monthly people
52 - classmates.com , 14M+ U.S. monthly people
53 - comcast.com , 14M+ U.S. monthly people
54 - shopzilla.com , 14M+ U.S. monthly people
55 - verizonwireless.com , 14M+ U.S. monthly people
56 - hp.com , 13M+ U.S. monthly people
57 - nytimes.com , 13M+ U.S. monthly people
58 - usps.com , 13M+ U.S. monthly people
59 - hulu.com , 13M+ U.S. monthly people
60 - wellsfargo.com , 13M+ U.S. monthly people
61 - reunion.com , 13M+ U.S. monthly people
62 - reuters.com , 12M+ U.S. monthly people
63 - ups.com , 12M+ U.S. monthly people
64 - metacafe.com , 12M+ U.S. monthly people
65 - netflix.com , 12M+ U.S. monthly people
66 - huffingtonpost.com , 12M+ U.S. monthly people
67 - capitalone.com , 12M+ U.S. monthly people
68 - icq.com , 12M+ U.S. monthly people
69 - digg.com , 12M+ U.S. monthly people
70 - overstock.com , 12M+ U.S. monthly people
71 - ezinearticles.com , 12M+ U.S. monthly people
72 - jcpenney.com , 12M+ U.S. monthly people
73 - monster.com , 12M+ U.S. monthly people
74 - tripod.com , 12M+ U.S. monthly people
75 - symantec.com , 11M+ U.S. monthly people
76 - nbc.com , 11M+ U.S. monthly people
77 - verizon.com , 11M+ U.S. monthly people
78 - pronto.com , 11M+ U.S. monthly people
79 - vzw.com , 11M+ U.S. monthly people
80 - dell.com , 11M+ U.S. monthly people
81 - simplyhired.com , 11M+ U.S. monthly people
82 - smarter.com , 11M+ U.S. monthly people
83 - cnet.com , 11M+ U.S. monthly people
84 - areaconnect.com , 11M+ U.S. monthly people
85 - linkedin.com , 11M+ U.S. monthly people
86 - nih.gov , 11M+ U.S. monthly people
87 - typepad.com , 10M+ U.S. monthly people
88 - ticketmaster.com , 10M+ U.S. monthly people
89 - expedia.com , 10M+ U.S. monthly people
90 - wikimedia.org , 10M+ U.S. monthly people
91 - ign.com , 10.0M+ U.S. monthly people
92 - time.com , 10.0M+ U.S. monthly people
93 - evite.com , 9.9M+ U.S. monthly people
94 - scribd.com , 9.8M+ U.S. monthly people
95 - pogo.com , 9.8M+ U.S. monthly people
96 - allrecipes.com , 9.7M+ U.S. monthly people
97 - gamevance.com , 9.7M+ U.S. monthly people
98 - gamespot.com , 9.6M+ U.S. monthly people
99 - sears.com , 9.6M+ U.S. monthly people
100 - citysearch.com , 9.3M+ U.S. monthly people
101 - associatedcontent.com , 9.2M+ U.S. monthly people
102 - foxnews.com , 9.1M+ U.S. monthly people
103 - nfl.com , 9.1M+ U.S. monthly people
104 - people.com , 8.9M+ U.S. monthly people
105 - intuit.com , 8.6M+ U.S. monthly people
106 - foxsports.com , 8.6M+ U.S. monthly people
107 - business.com , 8.5M+ U.S. monthly people
108 - macromedia.com , 8.5M+ U.S. monthly people
109 - washingtonpost.com , 8.5M+ U.S. monthly people
110 - mayoclinic.com , 8.4M+ U.S. monthly people
111 - homedepot.com , 8.3M+ U.S. monthly people
112 - city-data.com , 8.3M+ U.S. monthly people
113 - superpages.com , 8.2M+ U.S. monthly people
114 - medicinenet.com , 8.2M+ U.S. monthly people
115 - ca.gov , 8.1M+ U.S. monthly people
116 - lowes.com , 8.1M+ U.S. monthly people
117 - zimbio.com , 8.1M+ U.S. monthly people
118 - pricegrabber.com , 8.1M+ U.S. monthly people
119 - pandora.com , 8.0M+ U.S. monthly people
120 - gamefaqs.com , 8.0M+ U.S. monthly people
121 - metrolyrics.com , 8.0M+ U.S. monthly people
122 - fandango.com , 7.9M+ U.S. monthly people
123 - ed.gov , 7.9M+ U.S. monthly people
124 - myperfectcrush.com , 7.9M+ U.S. monthly people
125 - tv.com , 7.9M+ U.S. monthly people
126 - quizyou.net , 7.9M+ U.S. monthly people
127 - barnesandnoble.com , 7.9M+ U.S. monthly people
128 - foodnetwork.com , 7.8M+ U.S. monthly people
129 - cbsnews.com , 7.8M+ U.S. monthly people
130 - topix.com , 7.8M+ U.S. monthly people
131 - newsweek.com , 7.7M+ U.S. monthly people
132 - directv.com , 7.7M+ U.S. monthly people
133 - fedex.com , 7.7M+ U.S. monthly people
134 - howstuffworks.com , 7.7M+ U.S. monthly people
135 - allexperts.com , 7.7M+ U.S. monthly people
136 - dailymotion.com , 7.6M+ U.S. monthly people
137 - wikihow.com , 7.6M+ U.S. monthly people
138 - webfetti.com , 7.5M+ U.S. monthly people
139 - wunderground.com , 7.5M+ U.S. monthly people
140 - fda.gov , 7.4M+ U.S. monthly people
141 - kbb.com , 7.4M+ U.S. monthly people
142 - latimes.com , 7.4M+ U.S. monthly people
143 - kohls.com , 7.3M+ U.S. monthly people
144 - bloomberg.com , 7.3M+ U.S. monthly people
145 - autotrader.com , 7.2M+ U.S. monthly people
146 - singlesnet.com , 7.2M+ U.S. monthly people
147 - att.net , 7.1M+ U.S. monthly people
148 - tripadvisor.com , 7.1M+ U.S. monthly people
149 - drudgereport.com , 7.1M+ U.S. monthly people
150 - myiqquiz.com , 7.0M+ U.S. monthly people
151 - shopping.com , 7.0M+ U.S. monthly people
152 - webshots.com , 7.0M+ U.S. monthly people
153 - urbandictionary.com , 7.0M+ U.S. monthly people
154 - cheatcc.com , 6.9M+ U.S. monthly people
155 - southwest.com , 6.9M+ U.S. monthly people
156 - answerbag.com , 6.9M+ U.S. monthly people
157 - edmunds.com , 6.8M+ U.S. monthly people
158 - thefreedictionary.com , 6.8M+ U.S. monthly people
159 - java.com , 6.8M+ U.S. monthly people
160 - angelfire.com , 6.7M+ U.S. monthly people
161 - t-mobile.com , 6.6M+ U.S. monthly people
162 - oprah.com , 6.6M+ U.S. monthly people
163 - turbotax.com , 6.5M+ U.S. monthly people
164 - aa.com , 6.4M+ U.S. monthly people
165 - match.com , 6.4M+ U.S. monthly people
166 - bizjournals.com , 6.4M+ U.S. monthly people
167 - macys.com , 6.4M+ U.S. monthly people
168 - gigya.com , 6.4M+ U.S. monthly people
169 - break.com , 6.3M+ U.S. monthly people
170 - nypost.com , 6.3M+ U.S. monthly people
171 - nba.com , 6.3M+ U.S. monthly people
172 - fixya.com , 6.2M+ U.S. monthly people
173 - ning.com , 6.2M+ U.S. monthly people
174 - imeem.com , 6.2M+ U.S. monthly people
175 - legacy.com , 6.2M+ U.S. monthly people
176 - tvguide.com , 6.1M+ U.S. monthly people
177 - travelocity.com , 6.1M+ U.S. monthly people
178 - thefind.com , 6.1M+ U.S. monthly people
179 - suite101.com , 6.1M+ U.S. monthly people
180 - hotfreelayouts.com , 6.0M+ U.S. monthly people
181 - indeed.com , 6.0M+ U.S. monthly people
182 - hubpages.com , 6.0M+ U.S. monthly people
183 - ancestry.com , 6.0M+ U.S. monthly people
184 - sfgate.com , 5.9M+ U.S. monthly people
185 - accuweather.com , 5.9M+ U.S. monthly people
186 - squidoo.com , 5.9M+ U.S. monthly people
187 - taleo.net , 5.9M+ U.S. monthly people
188 - wikia.com , 5.8M+ U.S. monthly people
189 - cabelas.com , 5.8M+ U.S. monthly people
190 - drugs.com , 5.8M+ U.S. monthly people
191 - noaa.gov , 5.8M+ U.S. monthly people
192 - wamu.com , 5.8M+ U.S. monthly people
193 - snopes.com , 5.8M+ U.S. monthly people
194 - allposters.com , 5.8M+ U.S. monthly people
195 - hrblock.com , 5.8M+ U.S. monthly people
196 - myway.com , 5.8M+ U.S. monthly people
197 - yelp.com , 5.7M+ U.S. monthly people
198 - local.com , 5.7M+ U.S. monthly people
199 - cbssports.com , 5.7M+ U.S. monthly people
200 - auctiva.com , 5.7M+ U.S. monthly people