"much lower population" is correct and usable in written English.
You can use it when you want to talk about a population that has decreased significantly from a larger number. For example, "After the severe earthquake struck the city, the area had a much lower population than before."
Those two states have a much lower population density than California, Illinois, New Jersey, New York and most other blue states.
Even with a much lower population than today's, manufactured goods in the land-based economy were the preserve of the elite.
Such mobilization means developing some consensus on goals — perhaps through a global dialogue in which people discuss the human predicament and decide whether they would like to see a maximum number of people living at a minimum standard of living, or perhaps a much lower population size that gives individuals a broad choice of lifestyles.
The key difference is that Levittown's wonderful mass transit mostly lead directly to one central location NYC which is very different than the Bay Area in which jobs are diffused over a huge geographical area with a much lower population density (and again, the extreme environmentalists won't allow greater population density here without a big long costly battle).
Providing city services like police protection and garbage pickup across 139 ever-emptier square miles keeps getting more expensive and difficult (Detroit now has much lower population density than famously sprawling Los Angeles — although it's still denser than more recent boomtowns such as Houston and Phoenix).
This island has a much lower population than Tarawa, approximately 10,000.
But the survey also revealed much lower populations of wildlife popular with hunters.
Ms. Adarkar said that it is unrealistic to compare the per-capita open space of Mumbai to other cities with much lower populations.
In Western populations, the incidence of gastric cancer is much lower and population screening is not economically viable.
This is generally much lower than population coverage.
On the other hand, large portions of the Eastern Steppe have a much lower human population density than one would expect based on the productivity layer.
