On 39 servers with real players from the Steam list. Checked 20:18 UTC.
This page counts CS 1.6 servers from the Steam list that stand in the United States, by the IP address of the machine. It is the location of the server, not of its players: many communities rent machines in another country, often in Germany or France, where hosting is cheap and the ping is fine for half of Europe. Servers that only show up on their own non-Steam master lists, and there are many of them in Brazil and in the Russian-speaking world, are not in the Steam list and not counted here. And the time of day matters a lot: in the morning a country can have a few dozen players, in the evening hundreds.
Over the last 30 days servers in the United States had 490 real players at any moment on average - 9.1% of everyone on CS 1.6 Steam servers, #4 of 76 countries. Right now 226 people play on 39 servers there, mostly classic and zombie. The maps with the most players at the moment: de_dust2, de_nuke, de_inferno. The busiest time is Saturday around 03:00 UTC, the quietest Wednesday around 10:00 UTC.
23.26.135.150:2706030/32Real players74.91.127.86:2701829/32Real players185.150.189.24:2701627/32Real players185.150.189.24:2701525/32Real players144.48.106.220:2701524/32Real players23.26.135.135:2701524/32Real players82.21.92.173:2701524/32Real players185.150.189.24:2701723/32Real players162.222.16.154:2701823/32Real players167.148.170.210:2701523/32Real players74.91.121.121:2701521/32Real players74.91.127.23:2701521/32Real players216.146.25.245:2701820/32Real players74.91.113.63:2701619/31Real players82.39.109.131:2701519/32Real players82.47.164.48:2701518/32Real players23.26.135.104:2701516/16Real players96.60.48.55:2701516/32Real players74.91.112.92:2701513/32Real players74.91.127.86:2701213/32Real playersRight now 226, on 39 servers. Over the last 30 days it was 490 on average at any moment. This counts servers that stand in the United States, wherever their players live.
By real players right now: PUBLICO CLASICO ~ Drunk-Gaming (30 players), [TsG] Oficial #1 | Tachira Strike Gaming (29 players), ClassicCS.com | Old School #2 (27 players). The full list is below.
On Saturday around 03:00 UTC. The grid above shows every hour of the week in your own time zone.