Catholic colleges have several housing options available for students to choose from. Much like most colleges, some housing options are reserved for upperclassmen, while others will vary by price and necessity.
Most, if not all, Catholic colleges will offer a traditional residence hall option, which will have shared bedrooms, sometimes with a bathroom for each room or a communal bathroom for the hall, and other communal spaces like a kitchen or game room. Each bedroom typically holds 2-3 students. This option is sometimes limited to lower classmen (freshmen and sophomores), but often colleges will have different halls for the different years (ie. Freshmen residence halls, senior residence halls).
There are also suite-style accommodations, which is where a group of students shares a living space that includes communal areas like a living room, kitchen, and sometimes bathrooms as well, and then has several bedrooms that are split between the students. These groups are smaller than residence halls, providing more privacy and closer community.
Catholic colleges, and most colleges, also offer apartment-style housing, which is where a small group of students will split an apartment-like-space, with a bathroom or two, a kitchen, a living room, and a bedroom or two. This option is usually reserved for upper-classmen, and it provides a more real-life feel for students to help them understand what post-college living may feel like. This option is usually more expensive than typical residence halls or suite-style accommodations.
Some Catholic colleges may offer less traditional housing options, such as Greek sorority/fraternity houses, which students must join and be accepted before they are able to live in their designated and shared houses. Another uncommon option may be living-learning communities, where students are assigned housing with students who have similar academic/career goals.
Catholic colleges may also offer single-sex or coed dorms, which are typically unavailable at Christian colleges but are common among secular or state colleges. Some Catholic colleges will only offer coed residences, and others will go so far as to offer coed rooms. Usually, if a college offers coed dorms, they will also offer single-sex dorms to accommodate students who are uncomfortable with or have objections to sharing living situations with the opposite sex.
For more specific information on what housing options are available at the Catholic colleges that are of interest to you, be sure to check their websites and inquire with the admissions departments.