The Collection of Connected Discourses
2,904 suttas, grouped into 5 sections. Each section is further divided into chapters, totalling 56, each containing a group of suttas on a related topic.
The text itself suggests there are 7,762 suttas although many of these are repeated, with variations, throughout the nikāya.
Note: the number of suttas in the Saṁyutta Nikāya varies from one commentary / translation to another because of the abbreviated way parts of the text are written.
The 5 sections are:
Sagāthā-vagga - suttas containing verses, many shared by other parts of the Pali Canon - 11 chapters (1-11)
Nidāna-vagga - suttas relating to causation - 10 chapters (12-21)
Khandha-vagga - suttas relating to the five aggregates - 13 chapters (22-34)
Saḷāyatana-vagga - suttas relating to the six sense bases - 10 chapters (35-44)
Mahā-vagga - the great collection - 12 chapters (45-56)
Sagāthā-vagga
SN 1 - Devatās Samyutta - With Devatās
SN 2 - Devaputta Samyutta - With Young Devas
SN 3 - Kosala Samyutta - With Kosalan
SN 4 - Māra Samyutta - With Māra
SN 5 - Bhikkhuni Samyutta - With Bhikkhunis
SN 6 - Brahmā Samyutta - With Brahmās
SN 7 - Brahmana Samyutta - With Brahmins
SN 8 - Vangisa Samyutta - With Vangisa
SN 9 - Vana Samyutta - In the Woods
SN 10 - Yakkha Samyutta - With Yakkhas
SN 11 - Sakka Samyutta - With Sakka
Nidāna-vagga
SN 12 - Nidana Samyutta - On causation
SN 13 - Abhisamaya Samyutta - On the break-through
SN 14 - Dhātu Samyutta - On Elements
SN 15 - Anamatagga Samyutta - Without Discoverable Beginning
SN 16 - Kassapa Samyutta - With Kassapa
SN 17 - Lābhasakkāra Samyutta - On Gains and Honour
SN 18 - Rāhula Samyutta - With Rāhula
SN 19 - Lakkhana Samyutta - Lakkhana Samyutta
SN 20 - Opamma Samyutta - With Similes
SN 21 - Bhikkhu Samyutta - With Bhikkhus
Khandha-vagga
SN 22 - On the Aggregates
SN 23 - With Rādha
SN 24 - On Views
SN 25 - On Entering
SN 26 - On Arising
SN 27 - On Defilements
SN 28 - With Sāriputta
SN 29 - On Nāgas
SN 30 - On Supannas
SN 31 - On Orders of Gandhabbas
SN 32 - On Cloud Devas
SN 33 - With Vachagotta
SN 34 - On Meditation
Saḷāyatana-vagga
SN 35 - On the Six Sense Bases
SN 36 - On Feelings
SN 37 - On Women
SN 38 - WIth Jambukhādaka
SN 39 - With Sāmandaka
SN 40 - With Moggallāna
SN 41 - With Citta
SN 42 - To Headmen
SN 43 - On the Unconditioned
SN 44 - On the Undeclared
Mahā-vagga
SN 45 - On the Path
SN 46 - On the factors of enlightenment
SN 47 - On the establishment of mindfulness
SN 48 - On the faculties
SN 49 - On the right strivings
SN 50 - On the Powers
SN 51 - On the basis for spiritual power
SN 52 - With Anuruddha
SN 53 - On the Jhānas
SN 54 - On Breathing
SN 55 - On Stream Entry
SN 56 - On the Four Noble Truths