Comcast customers in Connecticut and the Northeast will get a boost in their broadband download speeds, including a 60 percent bump for the two lowest tiers of service.

Comcast offers Xfinity broadband, TV and telephone service in New Haven, Danbury, Waterbury Hartford and surrounding towns, and a swath of the Connecticut River valley. Other major Internet service providers in Connecticut include Altice USA, Charter Communications, Cox Communications and Frontier Communications.

Three of every four Comcast households in the Northeast will see their broadband speeds top 200 megabits per second under the upgrades. Those who had previously been downloading at 60 megabits per second are now getting 100 megabits, with the lowest tier pushed out to 25 megabits for accounts previously topping out at 15.

In the small print, Comcast does not guarantee those speeds which apply to downloads only, stating actual performance can vary.

Over the length of the current economic expansion, the number of Internet users has increased from 76 percent of the adult population in 2009 to 90 percent this year, according to the Pew Research Center think tank.

With increasing numbers of households opting to stream “over the top” channels like Amazon Prime, Hulu and Netflix piped to smart TVs rather than subscribing to cable TV packages, cable providers have been responding with back-end upgrades and new devices for the home. Norwalk-based Frontier is in the early stages of rolling out fiber optic cable to customer homes in Connecticut, with Altice USA already a year into a similar effort in Fairfield County.

As they do so, mobile carriers are laying the rails for “5G” wireless service to the home at 100 megabits per second, a viable alternative to the broadband speeds many cable customers have been getting the past few years.

Between April and June, Comcast lost 34,000 video customers on a net basis, but offset that with a net gain of 86,000 subscribers of high-speed Internet.

Speaking in mid-September at a conference in New York City, Comcast CEO Brian Roberts labeled broadband one of three “mega trends” that dominate industry thinking these days, along with direct-to-consumer platforms — subsidiary NBCUniversal recently unveiled its own called Peacock — and advances in delivering advertising across platforms.

Comcast also introduced recently Xfinity Flex for customers wanting only broadband, providing the enabling box and remote for free as opposed to its historic model of tacking on rental rates for cable TV boxes.

“We’ve pivoted the whole way we’re managing the company to focus on that (broadband) question,” Roberts said last month at a Goldman Sachs Group investment conference. “Now that you’ve got the speed coming to the house, we now have all these different devices throughout the house — we all want those devices to work everywhere.”; 203-842-2545; @casoulman