Definitely not 6 feet. I believe they are required to be 24" for the main line, but I wouldn't count on that given the age of your community. When they did my locate the first time they were off by well over a metre. I had them come back becuase I knew it was off. So don't count on those marks to be very accurate. One way to see if you are in the general area is to find the shutoff in the alley. That should be where the line starts. And it ends at the meter on your house, so ideally that would be a straightish line.
If they have replaced your line(they did mine about 10 years ago when they moved my meter outside) it will be a yellow plastic, otherwise I think they are black steel.
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