N.F.S. Grundtvig’s archive was donated to the Danish National Archives in 1890 and transferred to the Royal Danish Library’s Manuscript Collection in 1940. It consists of an estimated 120,000 manuscript pages, catalogued into 565 fascicles (i.e., archive packages). Even though the manuscripts were later repackaged into 200 acid-free boxes for preservation purposes, the division into 565 fascicles has been retained, as Grundtvig research has for decades referred to the contents of the archive using the fascicle numbers from 1 to 565.
Two larger groups within the archive are not included in the project, as they contain material letters written to Grundtvig (fascicles 406-482) and the papers left by his father, Johan Grundtvig (fascicles 536-565). Thus, the project only covers approximately 92,000 pages out of the estimated total of 120,000 pages.
Overall, the archive is divided into the following categories:
| Subject | Fascicles | Pages | Proportion |
| Sermons and ecclesiastical speeches | 1-74 | 32,100 | 35% |
| Ecclesiastical writings | 75-154 | 11,000 | 12% |
| Philosophical, literary, and political wiritings | 155-210 | 4,700 | 5% |
| Historical writings and collections | 211-250 | 8,400 | 9% |
| Mythological writings and studies | 251-287 | 3,500 | 4% |
| Studies on the Danish language | 288-305 | 3,500 | 4% |
| Studies on Anglo-Saxon language and literature | 306-331 | 3,400 | 4% |
| School / Pedagogical writings | 332-358 | 1,400 | 2% |
| Lectures and speeches | 359-379 | 6,000 | 7% |
| Hymns | 380-385 | 3,000 | 3% |
| Poetic writings | 386-405 | 8,200 | 9% |
| Letters to Grundtvig | 406-482 | omitted | |
| Personalia (in two series of fascicles) | 483-491 /500-535 | 5,200 | 6% |
| Historical narratives /Accounts, etc. | 492-495 | 600 | 1% |
| Diaries | 496-499 | 1,000 | 1% |
| Johan Grundtvig’s papers | 536-565 | omitted |