Do many homes in Denver have a sump pump? Do most Denver homes have basements?

I agree with Jacque. It is about 50% of the homes in the Metro areas will have basements.
As far as the actual number of those basements with sump pumps - I do not have a factual answer, but my estimated guess would be 50% of homes with a basement have a sump pump.

A sump pump is going to be more common in areas that have a higher water table and / or more expansive soils. A sump pump is designed to keep water out of basements, but it is not required in all areas.

Great question. To add insight to the answer, I'd estimate that approx 80% of Denver homes have basements as a result of frost depth and foundation design and yes, virtually all newer homes built beyond say 1980 have some type of sump system as required by code for foundation drains. Homes built prior to 1980 commonly have no foundation drains and many of those are now candidates for a retro fit installation. It is also common to find a foundation drain with a sump system with no pump or discharge simply because no water was expected around the foundation because of our dry climate,. You will also find a great number of foundation drains to be inside the perimeter of the foundation and footing. This would be surprising to anyone with experience in wet areas of the country where you commonly have robust foundation drains with drainage planes to direct water to the system. The flood and heavy rainfall event of 2013 dramatically changed the ground water and sub surface moisture of Colorado. Prior to the 2013 event in Colorado, our systems were best described as "if we have water" as opposed to "when we have water". The building code has evolved to require drains in window wells that was not present in the 2009 code. Jim Dischner - President, Egress, Inc.

Nearly all new homes have a sump "pit" but not all sump "pits" have a sump "pump." Builders are much better now than they were in the past and they know how to manage ground water with grading and collection pipes and pits. I grew up in the Denver area and every house I lived in had a basement. Basements are common in Colorado. Some smaller homes are slab-on-grade construction without a basement. Circling a home's foundation, below grade, homes with sump pits have a perforated pipe commonly called a French drain. This French drain collects water and discharges the collected water into the sump pit in the basement. If the water level in the pit rises on a regular basis then a sump "pump" is added to discharge the water away from the foundation. Some builders will only install a sump pump if the pit has collected water on a regular basis. Most inspectors suggest that a sump pump should be installed in the pit if any water is detected in the pit, I agree.
Water levels in Colorado are generally not a problem but some homes do have water problems due to neighbor runoff, excess rain or other landscape and water management problems. Before buying any home, I work with my buyers to ensure that the home is in good condition and that our inspector is qualified and understands the important details of managing water near a home's foundation.

This is a great question. Having moved here from a location that doesn't have basements, I am intrigued by them. Growing up, the only thing I knew of basements was that they were always featured in movies as a) where the horror began, b) where junior scientist performed their lab experiments, or c) hang outs for teenagers.

I have never been able to find any viable statistics about these basements but according to Metrolist records, of the 2,398 residential homes that sold in Denver (City and County) between October 15, 2010 and today, 1,216 (or 50.71%) had a basement and 1,182 (or 49.3%) did not. That's about as close as you can get to a 50/50 percentage without stepping on it exactly.

Your question about sump pumps is harder to tackle. I haven't found a reliable way of researching it, but I'll keep looking and when I do I'll let you know.

I think that maximum number of homes must be having sump pump. They are mainly installed in homes that avoid assistance of company like http://floodrepairguys.com/about to pump out water from basement. Though sump pump can be a better solution for water removal but there are certain times when such machines fail to give you proper service in such case it is better to take help of professional.

so reflecting on the flood in the Denver area would it be safe to say that those with basements and with sump pumps did much better than those without? Kinda silly not to jump have one? They are not that expensive so why not have one?