1. Nucleus: This is the primary location of DNA in eukaryotic cells (cells with a nucleus). The DNA is organized into chromosomes, which are long, linear strands of DNA tightly coiled around proteins called histones. This compact structure allows for efficient storage and organization of the vast amount of genetic information within the nucleus.

2. Mitochondria: These are the powerhouses of the cell and have their own separate DNA, known as mitochondrial DNA (mtDNA). mtDNA is circular and much smaller than nuclear DNA, containing genes involved in energy production.

In addition to these primary structures, small amounts of DNA can also be found in other cellular compartments like:

* Chloroplasts: In plant cells, chloroplasts, which are responsible for photosynthesis, also contain their own circular DNA.

* Plasmids: Some bacteria contain small, circular DNA molecules called plasmids that carry extra genetic information.

It's important to note that while most cells have their DNA primarily located within the nucleus, some cells (like mature red blood cells) may lack a nucleus altogether and therefore do not contain nuclear DNA.