Research Opportunities are available at universities and research labs across the US.
For the latest opportunities, join the LSU REU - SCIENCE Undergrad Research Opportunities Facebook Group
There are several large databases that are easily searchable.
Pathways to Science
Use the PATHWAYS TO SCIENCE WEBSITE to find programs such as undergraduate summer research opportunities, graduate fellowships, postdoctoral positions, as well as resources and materials pertaining to recruitment, retention, and mentoring.
Pathways to Science is a project of the Institute for Broadening Participation (IBP) that supports pathways to science, technology, engineering and mathematics fields. The institute places particular emphasis on connecting underrepresented groups with STEM programs, funding, mentoring and resources.
Research Connection list of opportunities -- 315 opportunities at elite universities
Oak Ridge Associated Universities (ORAU)
ORAU has a searchable database of research opportunities